McKinsey Solve Game (2021): How to prepare and ace the Imbellus

The McKinsey Solve Gameformerly known as the McKinsey Problem Solving Game or Digital Assessment, (colloquially also ‘the Imbellus’) is the consulting firm’s new tool to assess candidates in conjunction with the infamous case interviews and personal experience interviews. Let’s have a look at McKinsey’s assessment game.

Introduction of the Imbellus

In a series of games developed by Imbellus and psychologists from UCLA Cresst, McKinsey now wants you to save the world by building a sustainable eco-system in a reef, a mountain ridge, or protect a plant species from invaders, before starting your McKinsey career.

The launch and gradual introduction by the world’s most prestigious consulting firm has made quite some waves in the consulting space, mainly for two reasons. First, the Problem Solving Game is an actual computer game, which is a novel recruiting device in this industry. It replaces the Problem Solving Test (PST), which was a traditional pen-and-paper-based assessment that evaluated how well you can solve business problems under time pressure. Second, McKinsey touts that due to the nature of the games, you cannot prepare for it properly, which left applicants uneasy and confused about how to approach it. After all, McKinsey applicants are used to preparing weeks or sometimes even months for the PST and the job interviews.

Quick reality check…

It became clear relatively quickly that the latter was more of a marketing statement than anything else. We interviewed some of the first candidates, which took the initial Imbellus Test in London in November 2019 (the first round that was actually used as a screening device in the recruiting process and not just a beta test) and their feedback was very clear.

If they had known how the games would look like and what skills were tested, they could’ve managed it better. Some of them even prepared for the PST beforehand since they were unaware of any changes in the testing strategy. The link to the Problem Solving Game was sent out only seven days in advance.

We used their dissatisfaction as a starting point to sit down with experts on the topic while continuing to talk to more and more test-takers from all different countries at the same time. With their input, we were able to develop both strategies on how to prepare but also on how to play the games successfully.

In short: Contrary to the message sent out by McKinsey, you can actually prepare really well for this assessment and increase all relevant skills in a short amount of time. Our candidates have proven that with their significant outperformance vs. their peers in this regard.

In the following article, we will highlight the key features and aspects of the Imbellus Game, which should act as a starting point of your journey to master it.

This article will help you in five areas:

  1. We discuss the rationale that motivated McKinsey to switch from the Problem Solving Test to a gamified assessment and what that means for you
  2. We introduce you to the format and all 5 games that are currently part of the assessment (including some variations that have been reported to us) – always up-to-date
  3. We brief you on the actual skills that are assessed (beyond what is officially communicated)
  4. We discuss preparation methods, exercises, and tools to lift your performance
  5. We provide you with insights into proper test-taking strategies to get the best results

If you want to prepare most diligently and make sure that your scores reflect the skills needed to pass the bar, check out our detailed 104-page guide, Excel templates, and 4 videos, in which we discuss every detail of the games, including effective preparation methods and game-winning strategies. You get instant access to the guide, templates, videos, and a free 14-page primer for McKinsey case and PEI interviews. Currently, it contains feedback from more than 280 of our test-takers and several game designers (October 2021).

Be aware that StrategyCase.com was the first to report in detail on this new type of assessment based on genuine first-hand information. This enabled us to collect accurate and constantly expanding insights from our customers.

We released this original program at the end of November 2019 and, since then (after some others just copied and pasted our information), have continuously updated it to reflect the latest changes in the game. To date, more than 3500 applicants from over 60 nations have used the guide to prepare for their Imbellus. 

Currently, we offer a 50% discountFor more details, click here.

the image is the cover of the mckinsey imbellus problem solving game guide by strategycase.com
The StrategyCase.com McKinsey Solve Game Guide
StrategyCase.com McKinsey Problem Solving Game Introduction

McKinsey’s new Problem Solving Game, Solve

“Imagine yourself in a beautiful, serene forest populated by many kinds of wildlife. As you take in the flora and fauna, you learn about an urgent matter demanding your attention: the animals are quickly succumbing to an unknown illness. It’s up to you to figure out what to do—and then act quickly to protect what you can.”

McKinsey & Company

Sounds exciting? Well,…you be the judge.

As a consultant with McKinsey or in any other top-tier consulting firm, you often find yourself in situations where you must save the day. On an abstract level, the game simulates exactly this reality. While your consulting career mostly relates to strategy engagements with Fortune 500 companies, McKinsey chooses the environmental scenarios deliberately. More on that in a second.

Traditionally, the McKinsey way of hiring candidates was through the following funnel:

  1. Screening: Your consulting resume and cover letter are screening based on a number of filters
  2. Problem Solving Test: A 60-minute pen-and-paper test, covering 26 business-related questions
  3. Consulting Interview Round 1: 2 to 3 business case and personal experience interviews
  4. Consulting Interview Round 2: another 1 to 3 interviews depending on the region (Rounds 1 and 2 can be on the same day in some offices)

With the introduction of the Problem Solving Game (PSG), the Problem Solving Test (PST) is on its way out.

Why would McKinsey get rid of a battle-tested tool, which has been used to screen hundreds of thousands of applicants over the years and more importantly, replace it with a computer game?

The answer is quite simple and – as ever so often in the McKinsey world – threefold:

  1. To attract new talent and new types of consultants
  2. To have an assessment tool that is agnostic (in theory) of people’s backgrounds
  3. To have a lower-cost program (in the long run) to assess a greater amount of candidates

The Firm is employing the Problem Solving Game to take into account the changes that every consulting firm faces: Changes in its client base, new types of problems the clients face, and its own evolution through organic growth and acquisitions. New problems of clients require a new type of consulting workforce. The typical McKinsey career has changed. Hence, McKinsey is investing heavily in the recruitment of new types of talent, including data scientists, implementation practitioners, IT experts, product and digital designers, as well as software developers in addition to their generalist consulting roles. A digital test is only logical when hiring digital natives.

Above, we teased the environmental abstraction of the game tasks. What is that all about? McKinsey stresses that in order to perform well in the different games, no prior knowledge and preparation is needed or beneficial (contrary to the PST). The natural context should be easily accessible for every possible candidate, regardless of their background. The PST was geared more towards business majors and quant-heavy degrees, focusing on the evaluation with a simple pen-and-paper mechanic. With the Problem Solving Game, McKinsey has created a much more complex assessment tool to avoid any biases related to a candidate’s culture, experience, or background. Why this is a fallacy and just introduces new types of biases, a bit further down on this page…

Lastly, McKinsey is receiving several hundred thousand applications every year. Can you imagine going through all of them and dedicating proper resources to every single one of them? No? Right, because neither can McKinsey. High-level screening algorithms decide what consulting cover letter and resume gets screened by a human and even then, many candidates are quickly sorted out. As a result, many potentially talented individuals do not make the cut. The Problem Solving Game attacks this issue from two ends. First, administering the Imbellus Game to one additional candidate comes with almost zero additional cost for the Firm. The assessment can be taken from home (in most cases) and does not block many recruitment resources from the local office. It is pretty much streamlined and automated. For the PST, on the other hand, candidates had to go to the office to take the test, blocking quite a few resources in the process. Second, with a negligible marginal cost for one additional test-taker, more people can be evaluated and potentially deemed ‘worthy’ of moving on to the interview rounds, even if their resume lacked some important metric for the old screening algorithm.

To hit those three points, McKinsey hired Imbellus to develop the different games of the Problem Solving Game, a company that claims to reinvent how we measure human potential. A bold claim, eh?

Does the Problem Solving Game live up to this claim and fill its new role as a screening device for applicants?

The role of the new Imbellus test

As a candidate, the Problem Solving Game immerses you in a digital, scenario-based assessment, designed to understand and measure how you approach and solve problems, basically putting you in situations that McKinsey consultants face every day. This approach diverts significantly from well-known testing formats such as the PST or the BCG Online Case, which test business problem-solving skills.

A digital case interview

The Imbellus replaces the McKinsey Problem Solving Test (which has been discontinued in several offices such as Germany and Austria already years ago due to the bias it introduced – business majors usually got much higher scores).

While the PST is useful when gathering information about a candidate’s problem-solving skills, it introduces a bias towards candidates that are familiar with business problems. Since it favors business major backgrounds it is not in line with McKinsey looking to expand its hiring base. Also, the PST does not allow for understanding how the candidates arrived at a solution. The Imbellus Assessment allows McKinsey to get both a product score, evaluating how good your solution is, and a process score, providing insights into your problem-solving prowess and approach.

By changing this part of the recruiting process to an abstracted digital assessment, McKinsey hopes to gauge applicants’ cognitive abilities in a bias-free environment, while at the same time collecting way more data points on them.

The game format

In its current format, the Imbellus has you play 2 games out of a selection of 5 mini-games and lasts between 60 and 81 minutes. 95% of candidates currently play a variation of the ecosystem creation game and the plant defense game. Each candidate has to manage their own pace as long as both games are completed once the timer ends. We dive deeper into each game, the different strategies, and time management below.

While you play the game, McKinsey evaluates both a product score, i.e. what outcomes you create as well as a process score, i.e. how you approach each scenario.

The scoring of the Problem Solving Game

At its very core, the Imbellus test is still based on standard consulting cases and a consulting interview. You need to identify a problem, collect and analyze data, make a decision under time pressure and without complete information, and then formulate recommendations. For that matter, the games evaluate problem-solving skills – but online – using a variety of algorithms.

Initial test data suggest that a candidate’s performance on the Imbellus problem-solving simulation is a good indicator of whether he or she will land an offer after the case interviews. The predictive power is said to be higher than the one of the PST. See below for some hard data on the results.

the image depicts the correlation of success in the Imbellus McKinsey Problem Solving Game with the success in the case interviews
Median Construct Percentile through McKinsey & Company Recruiting Pipeline (Source: Imbellus)

The McKinsey Problem Solving Game analyzes the skills of candidates in conditions that are closer to real-life situations and that cannot be seen from a consulting cover letter or resume: what approaches do they use to find a solution, how creatively do they approach the task, how do they perceive the world and think. In particular, the test helps to evaluate:

  • the ability to correctly identify the problem that needs to be solved
  • analyze available information from various sources
  • find the right approach to solve the problem, including formulating and testing hypotheses strategically
  • draw the right conclusions and make the necessary decision
  • quickly react to changes in a situation or its boundary conditions

Again, in order to measure these traits, McKinsey and Imbellus calculate both a

  • Product Score: What was the quality of the outcome you reached? Did you manage to ”win” the games and create a sustainable eco-system or protected the plant successfully?
  • Process Score: How did you reach that outcome? Remember that every click is recorded in addition to 100+ other variables as you play the games. Were you nervous when clicking around? Did you execute an observable, rational plan?

Obviously, now you want to improve those skills in order to increase your chances to pass and get better McKinsey Imbellus test results. Worry not, we have compiled ways on how to train and prepare using feedback from experts and recent test-takers and how to get that Imbellus game preparation and practice. More on that later.

So how does this affect new candidates?

Current roll-out plan

It’s all fun and games until your score actually determines your future McKinsey career.

One of the most common questions we get from our candidates is if they actually have to take the Problem Solving Game during their McKinsey application. The answer is: likely yes.

Currently, the Firm is rolling out the game to different regions and types of applicants, set to assess a greater amount of people with more precise metrics. A full global roll-out was completed in the recruiting season of 2020 while many key markets already launched between January and June. While testing 5,000 candidates in 20 countries between May 2018 and October 2019 with the Imbellus assessment in addition to the PST, our internal customer data shows that McKinsey rolled it out to more than 60 countries by now.

Note that some locations might still employ the PST or the SHL, however, it is expected that all regions will transition to the Problem Solving Game within 2021 as the number of people that have to take the gamified assessment will grow “significantly over time,” as stated by McKinsey. Many candidates nowadays also play the Imbellus before being selected for specific recruiting events, such as the McKinsey Women’s Leadership Summit.

Similar to the PST, some countries might never adopt the new digital assessment and stick exclusively to interview-based assessments.

Regarding your desired role: The test is mandatory for candidates applying for vacancies in all practices: Generalist consulting roles, Operations and Implementation, Research & Analytics, Digital, and others. Only Orphoz, a McKinsey company focusing on transformations, does not seem to apply the Imbellus games (yet).

Timing of the Imbellus in the recruiting process

If you pass the consulting cover letter and resume screening successfully, you will receive an email with a link to the digitized assessment. You can choose the most convenient time for the test – as long as you do it within 7 calendar days after receiving the link. 

In some offices and geographies, you will be notified earlier (up to one month) about your deadline for the test or get a specific date on which you have to go to the office to take the test, sometimes in combination with the actual case interviews.

In any case, you should start to prepare as soon as possible to learn and internalize the specific skills tested in the Imbellus assessment.

You submitted the results – now what?

If you have taken the test from home, the notification of whether you passed the test and move on to the interviews will take between 2 and 14 days depending on the office and the number of candidates. The longest we have heard one of our candidates wait for his McKinsey Imbellus test results was a month (outlier!), and on average it was below one week. If you want to expedite the process because you have another offer and need to know, just call HR and they will most likely help you out.

If you have taken the Imbellus in the McKinsey office on the same day as the case interviews, your scores will be evaluated in conjunction with your interview performance. Hence, different offices rely to different degrees on the outcome of the assessment. For some, it is just an additional data point in the first round of interviews, whereas for others it is the gatekeeper to the interviews.

Apart from the official notification, you can estimate your performance quite well, at least for the first game. Our candidates have told us that it is easy to know whether they passed the first part of the assessment, the ecosystem creation because you can test for the sustainability of the food chain. As of late 2020, we have developed an Excel sheet that does the work for you. The tower defense game is much more chaotic and it is not entirely clear whether you score high enough for McKinsey standards.

In general, we expect the pass rate to be lower than the one of the PST (1/3 of candidates passed the cut-off score of roughly 70% correct answers) since more candidates will be administered the Problem Solving Game.

The consulting firm has run beta tests with a significant number of applicants and internal staff to calibrate the Imbellus assessment. Over time, we expect score inflation as people learn more about the test, and preparation efforts increase.

The skills assessed by the Problem Solving Game

While no business knowledge might be required for the Imbellus, the thinking processes and problem-solving prowess are still the same, whether its gamified or pen and paper. In order to maximize your scores in each game, you need to

  1. Understand the skills tested and have an in-depth insight into the games
  2. Learn proper preparation methods and techniques as well as game-winning strategies

Let’s dig into it.

The 8 core skills Imbellus games assess

The games are all about creating a profile of your skills in several areas. To do this, Imbellus captures and analyses every keystroke and mouse movement. In the end, you will be evaluated based on a product score and a process score. As discussed previously, the game not only evaluates the outcomes you generated but also the cognitive dynamic responsible for how you got there. For instance, it is important for the consulting firm to understand how you made the choices, or when you made errors, how you corrected them.

To score high in the games, you need to optimize both scores and understand the multitude of factors that affect the outcomes you are pursuing for each scenario at hand.

This gamified process tests the following key skills, which are not officially communicated by either McKinsey or Imbellus:

  1. Critical thinking: the ability to form a rational judgment from a set of facts
  2. Decision making: the ability to select the best course of action among several options
  3. Meta-cognition: the ability to use strategies to make learning information and solving problems easier (e.g., testing hypothesis, taking notes)
  4. Situational awareness: the ability to determine the relationships between different factors and to project the outcome of a scenario
  5. Systems thinking: the ability to understand cause & effect relationships involving several factors and feedback loops (e.g., anticipating several orders of consequence)
  6. Cognition: the ability to memorize, process, and store information to then integrate it with existing knowledge and retrieve it when needed
  7. Adaptability: the ability to change and adjust your actions and approach to a task in order to suit a new situation or new boundary conditions
  8. Creativity: the ability to find creative solutions, approaches, and ideas to different types of problems
The image describes all cognitive skills that the Imbellus McKinsey Problem Solving Game assesses
The actual skills assessed by Imbellus (Source: Imbellus and interviews with insiders)

All a candidate’s actions are tracked by the game and then assessed using data science to score the eight abilities. The digital assessment gives many more insights into candidates’ skills since McKinsey is able to collect and calibrate the test results of thousands of applicants over time.

The test looks into problem-solving skills, focusing mainly on the ability to work with multifactorial data as well as the candidates’ problem-solving approach. Consequently, it is as important to show how you solve the problem as it is to arrive at a feasible solution.

The Firm then applies people analytics on this fast-growing data set to evaluate, for example, a candidate’s creativity, and the ability to gather information and generate ideas. This approach allows the Firm to observe your thinking, just like in a typical consulting interview, however, in a much more efficient way.

How to demonstrate the most important skills

For instance, the Imbellus tracks your critical thinking skills while you sift through large amounts of data, discard useless information, analyze what matters, relate your findings, and eventually find the best solutions; all in a systematic and orderly pace and manner.

Also, Imbellus analyzes how you make decisions and arrive at conclusions based on the time spent in each menu and different parts of the game, and how you form your recommendation based on this.

The quality of your outcomes strongly depends on your metacognition, basically what tools you use to process and approach the games. While this cannot be tracked directly, the paths you take through the games provide insights into this dimension.

Situational awareness is another key metric and focuses on how well you are aware of the different elements of the games, the objectives, possibilities, and time constraints.

Systems thinking looks into how well you see interdependencies in the parameters of the games, i.e. matching the characteristics of the food chain with the location in the eco-system game.

Adaptability is especially relevant in the plant defense game with ever-changing map complexities and invader strategies that you need to react to.

Cognition supports you in all this by helping you to memorize information, store, and integrate it with existing data and retrieve it when needed.

Lastly, McKinsey is keen on seeing you come up with creative and novel approaches and solutions to the challenges. Do you deviate from existing candidates, yet, still solve the challenges?

In order to optimize both the product and the process score, you also need to understand what games are part of the deal.

Can you prepare for the Imbellus?

Now to the most important question. Should you actually prepare for the test since the official communication deters candidates from doing so?

Of course you should.

Our results show that preparation can significantly improve your outcomes. This is very relevant for the following reason: If you fail the Imbellus, you receive a 2-year ban to re-apply at McKinsey (1 year for internships). After such a ban, you need to demonstrate significant improvements via your consulting cover letter and resume.

While McKinsey itself argues that you cannot prepare for the games, Imbellus claims that their product measures higher-order thinking skills. Such skills are largely learned through education, training, and experience rather than innate personality traits and inherent cognitive abilities.

Let’s bring in some common sense here: Imbellus did not reinvent the wheel of gaming. The only difference to conventional computer games is that your actions are measured and linked to certain skills. And of course, if you like to play computer games and to explore digital worlds, you will fare better in a video game assessment than candidates who have never played such games. In that sense, the PSG is just introducing a different kind of bias to the candidate assessment.

So, how can you prepare and elevate your scores for the Imbellus? Let’s first look at the different games.

The scenarios of the McKinsey Problem Solving Game

Timing

The Problem Solving Game usually lasts 60 minutes (for 95% of the candidates we interviewed). However, based on all the input we gathered we have heard from candidates that had 71 minutes or even up to 81 minutes to complete their tasks.

In addition to the timed games, there are untimed tutorials before each game. These tutorials and trials have been expanded to better explain the different games during COVID19 since every candidate is going through the assessment from home. You can spend as much time as you want in the tutorials. However, the timed games cannot be paused.

The different scenarios

In its original form, the Problem Solving Game includes two individual scenarios revolving around environmental issues, the ecosystem creation, and the plant defense.

Be aware that new scenarios can pop up in the future. However, since the consulting firm wants to make sure that results and skills evaluation remain consistent over time – just as they do with their consulting interviews – they would not just introduce new scenarios to evaluate candidates right away. Rather, they would introduce variations of existing games OR introduce new scenarios for beta testing purposes, meaning that the latter will not be used to make decisions about a candidate but to correlate performance across scenarios and calibrate results and difficulty levels.

Starting in August 2020, we received some feedback about changes in the games. Some candidates got the ecosystem creation with a variation of the original game AND the disease identification game instead of the plant defense. In these cases, however, it was communicated that the disease identification was not used to score candidates but rather for future use and calibration in the Imbellus test. By October 2021 we have received only sporadic reports of the disease and disaster identification game. Rather, Imbellus has introduced a new game that we call migration planning.

Let us briefly look at each Imbellus game example.

The image describes the 2 core games of the Imbellus McKinsey Problem Solving Game, the ecosystem creation and the tower defense
McKinsey Problem Solving Game Scenarios

In general, you will encounter two distinct worlds, which are visually depicted and task you with different challenges:

Ecosystem creation

The first challenge candidates encounter is usually placed on a scenic mountain ridge or in a coral reef. The game gives you two objectives with the overarching goal to create a sustainable ecosystem. For this, you need to, first, select eight species (plants and animals) for a food chain and, second, match the food chain with a suitable location on the map.

In this scenario, regardless of the time, you are allocated (McKinsey recommends 35 minutes), your task is to create a sustainable and lasting ecosystem on a mountain ridge or in a coral reef based on the complex system and associated interactions of the food chain and the location itself. At the core, the game is an optimization problem. You will be confronted with an overload of different data points (similar to the McKinsey Problem Solving Test, yet not business-related). You match the location to the species as well as the species with each other based on many different characteristics such as calorie need or provision and environmental requirements such as temperature, sun exposure, etc. All requirements need to be fulfilled at the same time to create and sustainable ecosystem and to successfully pass this game.

There are 2 parts to it:

First, you need to decide on the location of the ecosystem to create good living conditions for several species. You need to consider several characteristics of the location such as altitude, cloud height, ph-level of the soil, wind speeds, precipitation, etc. for the mountain ridge or depth, temperature, salinity, etc. for the coral reef.

Second, you need to pick 8 species, either predator, prey, or producer, to inhabit the mountain or reef location. Selecting a suitable, heterogeneous sample for the food chain relationship out of the numerous species is crucial. You need to account for the interaction effects between the species (e.g., coral, aquatic animals, algae, etc. in the reef) and several individual characteristics such as the required environment, place in the food chain, how many calories they need to survive, or how much energy they need, how many calories or energy they provide when consumed, etc.

The catch in this game is that you are presented with information overload and need to show proper systems thinking. The food chain must not collapse, and the ecosystem must sustain itself. You will know if you have provided a good answer before submitting it since you can test your hypotheses to see if the ecosystem could actually sustain itself.

The image is a screenshot of the Imbellus McKinsey eco-system creation game
Screenshot from the McKinsey PSG (Source: Imbellus)

In summer 2020, McKinsey started to introduce new boundary conditions to make the game more challenging. For instance, you not only need to create the food chain with several levels and match it with a location but also adhere to certain new rules related to the hierarchy of the food chain. This twist adds another dimension you need to consider when drafting your solution. Roughly 5% of the people, we talked to, encountered this particular variation of the game back in 2020. By June 2021, almost all candidates report these more elaborate eating rules as part of their assessment.

There are several ways on how to approach this scenario, which we worked on with our candidates and created an Excel sheet that helps you solve the eco-system puzzle. Below is a high-level approach you can use when going into the game:

  1. Decide what to focus on first (location or food chain)
  2. Select the location (2a) or create the food chain (2b)
  3. Build your food chain bottom-up (3a) or top-down (3b)
  4. Test your result before submitting using a 4-step process

Most importantly, have a plan ready before you start:

1. Do you want to pick the location first or the food-chain?

2. Do you want to build the food chain top-down or bottom up?

There is no single right way to do it. Choose what works best for you and stick with it throughout the game. We discuss each strategy with a step-by-step approach as well as provide you with an Excel sheet that automatically checks the sustainability of your ecosystem in our McKinsey Problem Solving Game Guide.

Tower defense

In the second scenario, you need to defend a plant species from invaders using several tools at your disposal in a static, round-based tower defense-style game. The tools consist of barriers that slow down invaders and predators that damage and eradicate them.

In this scenario, which has been described as more challenging than the first, you need to defend plants from an invasive species for as long as possible. This scenario is broken down into 3 rounds. Each round lasts between 10 to 12 minutes, presenting a slight variation of the game with increasing complexity and an increase in the map size. For each game, invaders spawn in several turns per map.

Each round is divided into two parts.

In the first part, you can actively manage your defense strategy in order to react to new invaders that spawn every 3 to 5 turns. You can manage 15 turns by placing your defense units on the map.

Your goal is to have the plants survive each of these increasingly difficult turns. You can slow the invaders down so that they do not arrive at your plant within the number of turns or eliminate them fully before they would do so.

In the second part, the endgame, you are no longer able to change your strategy and the placement of your defense units. The game fast forwards until your plant is defeated. Depending on the quality of your last placement strategy it might take the invaders many turns to kill the plant.

Your goal is to optimize for the plant to survive as many turns as possible. Your product score is the direct result of the turns survived, while your process score focuses on how well you adjust to changing behaviors of attackers and how much you can learn and adapt over the course of the turns and over the course of the 3 rounds.

In order to do this, you need to choose certain animals that eat the invasive species and natural barriers/ terrain to slow them down and block them.

The game is static and turn-based in nature and not dynamic like many other tower defense games. Before each turn (or after every 3rd or 4th turn in some variations), you can devise or revise your strategy and select a number of animals and barriers to protect your plant.

You are presented with information about what each tool such as animals or geographical/ terrain barriers can do, e.g., how many invasive species an animal can kill in a given time or how much a forest can slow the invaders down. These animals have different stats in terms of their reach/ sphere of influence (shown as squares) as well as the damage that they are able to inflict on the invaders.

For instance, there could be a dog and an eagle as animals. The eagle has a large radius and inflicts less damage whereas the dog has high damage but a smaller range of effectiveness (e.g., one square only). Some animals have a large radius and high damage. The damage inflicted might also differ depending on the type of invader. The barriers are elements such as mountains, rocks, grass, and forest.

  • Mountains block invaders and make them change their pathway towards the plant (ideally make the pathway longer)
  • Rocks, grass, and forest slow invaders down (different effectiveness for different invaders)

The invaders will start attacking the plants once they reach the sphere of influence. The more invaders are in the sphere, the more damage is done to your plant. Also, the more time they spend in the sphere, the more their level of damage will increase; it multiplies over time.

While initially, you will be able to kill the invaders, they will show up in greater numbers in each consecutive wave and it is possible that you will be defeated. This is not, per se, a bad thing since it will die eventually in the fast forward mode of the game. Keep the plant alive for as long as possible.

The image is a screenshot of the Imbellus McKinsey plant defense game
Screenshot from the McKinsey PSG (Source: Imbellus)

The aim is to defend the plant in the center for as long as possible, hence, to kill all invaders before they reach the plant. It is very important to make use of both defending animals and barriers to unlock their synergistic effects and keep the invaders as long as possible in the sphere of influence of the animals.

Use the untimed tutorial to think about the most effective combinations and layouts of the tools before starting the game. Prepare using video games in the tower defense niche to train yourself for this scenario. The key in this game is to show adaptability by being able to learn quickly, improve your strategies and reactions with each turn and with each game.

Creating a strategy

Let’s again break down your approach into several steps.

  1. Understand the map
  2. Understand the stats and route(s) of the invaders
  3. Understand the stats and capabilities of your defense mechanisms
  4. Draft your initial strategy
  5. Adjust your strategy as the game evolves

We discuss each step, variations, and successful start-to-finish strategies in full in our McKinsey Problem Solving Game Guide, which has been co-created with the help of tower defense game designers, who developed games for iOS and Android.

Disease or disaster identification

It seems that McKinsey reintroduced a game that was already present in the beta testing stages of the PSG, with a slight variation. It replaced the tower defense game for roughly 5% of the candidates over the course of late 2020 and early 2021. By June 2021, it appears that both games never really made it out of the testing stage and we only receive sporadic reports from our candidates nowadays. Nonetheless, let’s look into them since we cannot guarantee that they won’t come back in one form or another.

As a player, you are tasked with identifying which animals on the map will be infected by a given disease. The nature of the disease is not important. What is important is to identify patterns of the disease and ultimately identifying which animals would be infected in the next turn.

Contrary to the old version which was used in beta tests before the game was actually launched, you do not need to provide a remedy or a treatment plan. We discuss this game including a video briefing in greater detail in our PSG Guide.

So far, another game that was used in the beta version ‘disaster identification’ has not made a new appearance. In this game, beta testers had to figure out the nature of a natural disaster impacting an animal population. Be mindful that you could be one of the first to actually deal with this game again. Yet, the mechanics are the same as for the disease identification game. It might very well be similar to the ecosystem creation game that can take place either on a mountain or in a coral reef; just adding some variation to the context.

The image is a screenshot of the Imbellus McKinsey disease identification game
Screenshot from the McKinsey PSG (Source: Imbellus)

Migration planning

A new game that appears to have arrived in the Imbellus Game is what we call the migration planning.

Your task is to plan the migration of 30 to 50 animals from a starting position to an endpoint on a map by selecting the best route out of several alternatives.

You have to solve up to 15 different scenarios within 35 to 40 minutes. Each scenario consists of 3 to 5 turns that have you decide on the next step of your route. In turn 1 you select the first step on your route, in turn 2, the second leg, and so on until you reach the desired endpoint.

You start with a given number of animals and a specific set of resources (consumables such as food or water). With each turn of the game, a predetermined number of animals will die, and resources will be reduced by a specific amount, depending on your selected route. Alternatively, you can also select intermediate points on your route that will replenish and multiply existing resources as well as collect additional animals along the way.

The objective of the game is two-fold: First, you need to ensure that the highest number of animals survives until you reach the destination. Second, you need to arrive at the endpoint with some of the resources preserved as well. As said before, there are up to 15 different scenarios with 3 to 5 turns each, which leads to 45 to 75 unique decisions you must make along the way.

We provide you with a specific table and approach that you can use to create your strategy for each route in our McKinsey Problem Solving Game Guide.

the image depicts the mckinsey imbellus migration management game

Prepare for the McKinsey Problem Solving Game

McKinsey tells candidates that preparation is not needed and not possible. However, the feedback we have collected from more than 240 candidates point to the fact that you can actually prepare really well for the different scenarios.

For that matter, we have analyzed the test, talked to game design experts and test-takers, and turned to science-backed methods to create a very detailed guide for the game and its mechanics.

Below are some higher-level pointers you can use as the foundation of your preparation.

Imbellus game practice

Train the key skills that are being assessed by Imbellus. Playing logic games, mobile games, and tower defense games with similar themes can be beneficial to train these areas specifically. While these games will differ somewhat in their user interface, objectives, and mechanics they still train your skills, make you think about potential strategies, and just get you in the habit of interacting with a gamified environment. If you have sufficient time before taking the Imbellus, try out some of the games below to practice the Imbellus gameplay.

Games for the ecosystem and migration planning

Games for the plant defense

Figure out what your weaknesses are and tailor your preparation with specific problems to solve. Additionally, this preparation will benefit your case interview skills. McKinsey Problem Solving Game practice could very well make the difference between your success or failure.

General preparation advice

In addition to playing games that are similar to the Imbellus, there are a few other things that you need to do to improve your performance on the relevant metrics.

  • Develop and internalize a plan on how to approach every decision. Use a step-by-step decision-making process to help you make more deliberate and thoughtful decisions. This approach increases the chances that you will choose the most satisfying alternative possible by organizing relevant information in all games. Learn the steps below before attending the Imbellus, as these steps are crucial for each of the 5 games.
  1. Identify the decision. Clearly define the nature of the decision you must make. What is the real goal that you need to achieve and what side quests does it entail?
  2. Gather relevant information. Collect some pertinent information before you make your decision: what information is needed, what are the best sources of information, and how do you get it.
  3. Identify the alternatives. As you collect information, you will identify several possible paths of action or alternatives.
  4. Weigh the evidence. Draw on your information to imagine what it would be like if you carried out each of the alternatives to the end.
  5. Choose among alternatives. Once you have weighed all the evidence, select the alternative that seems to be the best one.
  6. Review your decision and its consequences. Consider the results of your decision and evaluate whether or not it has resolved the need you identified in step 1.
  • Just as for the actual case interview, learn how to take proper notes. Write down your observations on the mechanics of each scenario. Prepare Excel templates that can guide you during your assessment. It will help you structure your thoughts and reach a solution quicker. As Imbellus states, so far, the notes have been collected after the test. However, it is unlikely that they will be taken into consideration for the screening decision. The game itself provides more than enough data points to automatically analyze a candidate. This is only relevant if McKinsey were to decide to conduct the Imbellus in an office setting again.
  • Learn how to structure problems. Learn to structure, analyze and synthesize complex problems to help you develop recommendations by combining logical thinking and creativity. When asked a question, take some time to structure your analysis (similar to when you are structuring your approach in a case interview). Consider what topics you want to look into, what information is needed, and how you can get this information, all with the goal to gain key insights in the shortest possible time to come up with excellent analysis. The goal is to derive creative and sustainable recommendations that are effective.
  • Learn how to tackle problems with a hypothesis-driven mindset. Use a hypothesis-driven approach to guide your thinking and problem solving to reach sound recommendations or actions. In order to direct your analysis, give it clear focus, and help you to find the problems and derive recommendations quickly, train to come up with one or more hypotheses at the start of each game, then test and refine the hypotheses as you move along.
  • Learn how to visualize processes and relationships. One of our favorite habits we recommend in consulting interviews is to apply a process-based view of the problem at hand. Before tackling the Problem Solving Game, you should internalize ways of creating quick sketches to visualize situations, processes, relationships, and patterns. Mapping out a process can be useful in several scenarios, especially when you are not familiar with a certain task or system of interactions. When laying out what constitutes a certain issue, you will be able to understand it by breaking it down into its constituent parts.
  • Get comfortable with estimations and simple math. Simple and quick math is needed for all games since you need to calculate the different calorie budgets in the ecosystem game, the multiple damage points of your attackers in the tower defense game, as well as the optimum route in the migration planning game. That way you will be able to calculate and compare the expected outcomes of several options. After all, that is the same skill that was already needed for the McKinsey PST and is still needed for the consulting case interviews that follow the digital assessment.

Apply the right strategies for every game

Strategies for every game

Each game of the Imbellus requires a different approach and mindset. We have summarized each strategy in the infographic below on a higher level. For step-by-step instructions of winning strategies, check out our McKinsey Problem Solving Game Guide.

Ecosystem creation

Build a food chain pyramid by selecting 8 species (animals and plants).

  • Optimize for caloric supply and intake
  • Build top-down from the main predator
  • Adhere to randomly generated boundary conditions and eating rules

Select the location where all species can survive.

  • Look for the key influencing variables
  • Match across food chain and location

Plant defense

Protect a plant on the map from invading species by placing a combination of animals and barriers to

  • slow down
  • decimate the

attackers and prevent them from reaching and attacking your plant. Make sure that the plant survives for as many turns as possible.

Disease/ disaster identification

Identify a subset of an animal population that is affected by a disease or disaster.

  • Identify patterns of how the disease spreads based on certain characteristics in the animals
  • Predict what subset of the population will be affected next by extrapolating the progress of the disease / disaster

Migration planning

Organize the migration of 30 to 50 animals from one spot to the next by managing resources and animals from start to finish in 3 to 5 turns. Select the most optimal route to preserve resources and animals along the way and pass 15 rounds in total.

Map the routes on a piece of paper or in an Excel sheet.

  • Write down each available route
  • Calculate the outcome variables for resources and animals for every route
  • Select the route where most animals survive and resource requirements are met
the image shows game strategies for the mckinsey imbellus problem solving game
McKinsey Imbellus Problem Solving Game Strategies

Strategies to adhere to for all games

Additionally, we have compiled some tips to get you started on your way to master the games. Internalizing them will also help you during your consulting interviews in general:

  • Do not try to replicate results or solutions since every test taker will face a uniquely generated scenario in the Imbellus recruiting game. All games are set in an ecological context to be accessible to all backgrounds. At the same time, no two test-takers will have the same experience as there are tens of thousands of possible variations of the same game, all with the same level of difficulty. Artificial intelligence should ensure that the virtual environments and animals look are indistinguishable from reality to put candidates in a flow state and full immersion when playing the game. Focus on the process instead and replicate strategies (which we have devised in our guide)
  • Get ready to make 80/20 decisions based on incomplete information. Likely you won’t reach the best answer within the given amount of time, however, you should reach a good answer, demonstrating a clever problem-solving strategy along the way. Be careful not to get bogged down by the details and losing yourself in the several subcategories the game provides. Similarly, test your ideas and write down the different outcomes
  • Read the instructions carefully. With an increasing number of variations in the games, some candidates have reported to us that they initially did not see a particular instruction, making their solution for the ecosystem scenario invalid. Make sure that you understand clearly what your task is
  • Make sure your setup works if you are taking the test from home: before starting the test, the system will automatically check the internet connection. Still, make sure that your computer is charged, the internet works, and your system is stable since the test cannot be repeated or paused when it crashes. Candidates with older computers and laptops reported that their CPU usage was maxed out and the fans were going on full steam. Make sure that this all checks out before and borrow a laptop from a friend if you think your system can’t handle it! If an issue presents itself during the test, you can always talk directly to the 24/7 Imbellus service center
  • As with the Problem Solving Test – Keep an eye on the time! It is easy to get lost in the details and the sheer complexity of information overload the test presents. However, make sure to go swiftly through the tutorial, keep track of the time, and roughly stick to the 30 minutes for each scenario. The progress bar on top shows the remaining time, however, there is no clock or explicit mention of the time left

Now, we have a lot more to offer with regards to proper preparation methods, and test-taking strategies. Check out why you would benefit from our Guide below.

How our guide boosts your score

If you want to improve your score and increase your chances to pass the test, check out our 104-page guide (including Excel templates, and 4 videos on the interface and the gameplay strategies of all games + a free McKinsey interview primer) with a detailed look at each scenario, proven methods on how to prepare for the Imbellus game, as well as examples, tips, and strategies to win the games. You get instant access to the PDFs, the Excel templates, and the videos. Our guide is the gold standard in McKinsey Imbellus Problem Solving Game preparation for a few reasons:

Benefit from our experience since the inception of the game

  1. We were the first and the only ones to offer a guide based on genuine, first-hand information. We started out by interviewing trial test-takers, game design, and assessment experts in November 2019
  2. We continuously interview our customers and now have a database of more than 280 first-hand experience reports and feedback
  3. Their feedback has helped us to reach more than 3500 test-takers in more than 60 countries and continuously improve the guide and adjust it to the latest changes McKinsey is introducing. We usually update our guide once a month or whenever our candidates report significant changes. Once you buy the guide, you will receive future updates before your testing date
  4. As former McKinsey consultants and consulting interviewers, who left the firm recently, we have a deep understanding of how McKinsey thinks and evaluates candidates. Benefit from our specific insights you will not find on generic case websites with coaches that never worked in consulting or did a 6-month stint in a different firm several years ago
  5. We go into more detail about the interface and the gameplay strategies in a 4-part video commentary for all games in addition to the written guide and the Excel templates. It is much easier to discuss the McKinsey Imbellus game secrets on actual screenshots in the video format

Battle-tested approach for high scores

Our preparation strategy is based on 5 pillars:

  1. We help you understand what McKinsey is looking for in their new generation consulting force
  2. We teach you in great detail how the scenarios and different games look like (user interface, gameplay mechanics) as well as what you need to do (objectives, core problems)
  3. We discuss the 8 core skills that are assessed by McKinsey and how you can train them with actionable advice, methods, tools, exercises, and links to external resources
  4. We provide you with test-taking strategies and actual tools that work! Learn how to really approach the eco-system game, the plant defense, the disease identification game, and the migration planning (October 2021) in written and on video. We collected them through our interviews by correlating candidate approaches with their successful outcomes. Over time, the outperformance of our candidates that applied our McKinsey Imbellus game secrets over their peers has steadily increased.
  5. We show you the right hacks to fast-track your preparation and get ready for the Imbellus in no time.

Additionally, you get access to our McKinsey applicants’ inner circle where we will provide answers to all your consulting interview questions within 24 hours.

Also check out our other products and services, specifically tailored to rocking your McKinsey interviews.

Our McKinsey Imbellus Guide

The original and most comprehensive guide from former McKinsey consultants with

80% pass rate in the Imbellus Game

Your benefit

  • Crack each of the 5 games with our proprietary guide and video insights on the exact steps
  • Score high with tailored strategies and gameplay walkthroughs based on successful test-taker feedback
  • Focus on what matters most and don’t waste time in your preparation with proven ways to master all skills
  • Prepare 100% confident for the latest changes in the scenarios with our constant update policy and free lifetime access guarantee

Our credentials

  • Helped 3500 students from more than 60 countries since November 2019
  • Based on 280+ test-taker interviews since the inception of the game, expert game designer input, and our McKinsey experience
  • Includes a 104-page guide, Excel templates with formulas, and 4 videos on the gameplay and winning strategies + A FREE 14-PAGE MCKINSEY INTERVIEW GUIDE FOR CASE AND PEI
  • 100% proprietary content – often copied, never equaled
The image is the cover of the StrategyCase.com McKinsey Problem Solving Game Guide

McKinsey Solve Game Guide (Imbellus) 10th Edition (incl. videos and Excel templates)

SALE: EUR 64 / EUR 34

If you have taken the Imbellus game and want to share your experience and Imbellus game tips or have further questions, please let us know in the comment section below!

 

13 Responses

  1. Angelina says:

    hi Florian,

    I only have 3 hours before the PSG is due, is it possible or useful to buy the guide given such a short time limit?
    Thank you

    • Florian says:

      Dear Angelina,
      3 hours would be enough to read through the strategy section, watch the videos and familiarize yourself with the Excel. While not ideal and we receommend more time to practice, it would still make sense.
      Cheers,
      Florian

  2. […] using digital badges to recognise learning and, for example, the consultant company McKinsey uses a game during its recruitment process,” adds Nikoletta-Zampeta […]

  3. Keyi Yu says:

    Hello Florian Daniel or Colleague,
    I am very pleasantly surprised to see this guide that you have masterfully complied. Having tips from insiders is such a confidence boost! I purchased this pack without hesitation and am hoping to try it out before investing in the comprehensive 6h coaching program.
    Nonetheless, I wonder if you can email me back by helping me with downloading the actual guide? I encountered a technical issue whereby I completed my payment on my phone, but it became impossible to download it via my laptop. I am very worried as the deadline of the test is approaching so could you please get back to me asap?

    Many Thanks
    Aspiring Consultant

    • Florian Smeritschnig says:

      Hey there,

      I have just sent you your documents, which also contain access to the video program.

      Please let me know if I can assist further.

      Kind regards,
      Florian

  4. Emmanuel says:

    Hi, how long would you suggest I prepare for the McKinsey digital assessment test after purchasing the digital assessment guide? 2 weeks? 4 weeks?

    • StrategyCase says:

      Hi Emmanuel,

      We have candidates that prepare between 2 days and 1 month. The shorter your preparation time, the more your focus should be on learning the proven strategies we outline in our guide (so that you can implement them properly on the game day) and go through and practice the most effective and important tools we provide you with to quickly raise your skill levels.

      Obviously, when you have more time on your hands, you can prepare in a much more relaxed way and go deeper with all our exercises and tools. Generally, I would say that 2 weeks is the sweet spot we have seen with our candidates and it is rare for them to fail after they have gone through all exercises and tools, practiced the preparation tips, and have our game-plan and strategies internalized over this time period.

      4 weeks would give you enough time to prepare without a rush, and in parallel to the case interview practice. In any case, should something change in the game between your purchase and the testing date, we will send you a new version of the guide and the videos free of charge!

      Let me know if you have any further questions!

      All the best for your preparation and your application.

      Florian

  5. Luiz says:

    I heard that there are also other games that could be part of the PSG like predicting and preventing an environmental disaster. Are you sure that there are ‘only’ the 2 two games you describe?

    • StrategyCase says:

      Hi Luiz, we talk briefly about these potential other scenarios in our Problem Solving Game Guide. Be aware that they were used during the trial stages in 2018/19 only and none of our more than 700 customers has reported on them pro-actively. From the 80+ customers we interviewed since November 2019, all went solely through the ecosystem game and the tower defense-like game. In the ecosystem game, recent candidates report having done the mountain ridge scenario and not the reef (even though this has no impact on the actual gameplay).

  6. Patrícia says:

    Hi, how do I know if I passed the ecosystem simulation task?

    • StrategyCase says:

      Hi Patricia, on an aggregate level the game looks at both your product score (did you produce a good outcome?) and your process score (did you perform well under stress while working towards the outcome?).

      In order to pass the ecosystem simulation, ideally, you reach the threshold McKinsey set for both scores (which is unknown). For the product score, you should be able to test your hypotheses during the game and see if your food chain is actually sustainable and works out. However, for the process score, you can only take a guess. McKinsey and Imbellus record every movement of your mouse, every click, as well as how long you pause, go back and forth in the menus, etc. In short, the more you have worked in a calm and collected manner towards selecting your food chain, the higher the chances to reach a solid process score.

  7. Federico Minotti says:

    Hi, I have one question, Is McKinsey problem-solving game material included in Mc Kinsey program?

    • StrategyCase says:

      Hi Federico, do you mean the Video Academy or the Interview coaching?

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