Ocean Cleanup was an older ocean/microbe scenario inside the McKinsey Solve assessment. It is no longer the format candidates should prepare for; the current ocean/microbe task is the Sea Wolf game.
Sea Wolf keeps the core averaging logic, but adds a profiling step, three contamination sites, and a more explicit scoring model.
If you found an old guide or forum thread about Ocean Cleanup, use this page as a translation layer. It explains what Ocean Cleanup was, how it differs from Sea Wolf, why names like "ocean treatment" and "microbe game" still appear, and which old prep habits are still worth keeping.
What was the Ocean Cleanup game?
Ocean Cleanup asked candidates to solve a marine-pollution problem by selecting microbes that could clean plastic from the water. The key input was a grid of 20 microbes, each described by traits such as pH tolerance, heat resistance, and photosensitivity.
Original walkthroughs usually described two decisions:
- First, choose 10 microbes from the pool of 20.
- Then, combine 3 of those 10 into the final treatment.
The score depended on how well the chosen treatment's average characteristics fit the target conditions. That is the piece worth remembering from old material. The old task was shorter than Sea Wolf: about 20 minutes across one or two contamination sites.
In candidate forums, the same task may be described as the "ocean treatment" game, the "microbe game," or simply the "ocean game." Those names describe the same ocean/microbe task family, not separate McKinsey assessments.
Ocean Cleanup vs Sea Wolf: what changed
Sea Wolf kept the averaging idea and rebuilt it into a longer, more structured format. The side-by-side below shows what carried over and what changed.
| Dimension | Ocean Cleanup (retired beta) | Sea Wolf (current) |
|---|---|---|
| Status | Legacy ocean/microbe scenario | Current Sea Wolf game inside McKinsey Solve |
| Sites | One or two contamination sites | Three progressive contamination sites |
| Duration | About 20 minutes | About 30 minutes |
| Profiling step | None | Yes: pick 2 of 5 microbe characteristics to profile before site work |
| Core mechanic | Choose from a microbe pool, then build a 3-microbe treatment | Same averaging math, expanded into a four-phase per-site flow |
| Scoring | Treatment works when average attributes match the site conditions | Penalty model for missed attribute ranges or trait requirements; each miss reduces effectiveness by 20% |
For the full per-site mechanics, the four-phase flow, and the scoring detail, see the Sea Wolf game guide. The table above stays short because this page is about the legacy name, not a full Sea Wolf walkthrough.
Why the names overlap
McKinsey Solve game names and formats have changed over time. Ocean Cleanup fits that pattern: older material uses the ocean/microbe scenario name, while newer prep sources use Sea Wolf for the expanded version of the task family.
The informal labels came from what candidates could see in the task. "Ocean treatment" described the cleanup goal, "microbe game" named the units candidates were selecting, and "ocean game" was shorthand. If you are untangling older sources, the Imbellus era article covers the broader assessment naming history, while the legacy McKinsey Solve games overview shows where the older games fit.
What old Ocean Cleanup prep still helps?
Keep exercises that train the math: reading attribute ranges, averaging three microbes, and checking a treatment against target conditions.
Skip old advice that treats the task as a short 20-minute, one- or two-site game. If you are actively preparing, work from the Sea Wolf prep guide for game-specific practice and the current Solve prep plan for the wider assessment.
FAQ
Is Ocean Cleanup still part of McKinsey Solve? No. Treat Ocean Cleanup as a legacy ocean/microbe scenario name. Candidates preparing for McKinsey Solve should focus on Sea Wolf and any other games listed in their invitation.
Is Ocean Cleanup the same as the Sea Wolf game? They are related versions of the same ocean/microbe task family. Ocean Cleanup describes older material; Sea Wolf describes the current format with added profiling, three sites, and explicit penalty rules.
Why is Sea Wolf also called "ocean treatment" or "microbe game"? Candidates often name assessment games by what the task shows on screen. In this case, the ocean cleanup setting and microbe-selection mechanic produced informal labels that still circulate in older forums and prep notes.
Key takeaways
- Ocean Cleanup is a legacy ocean/microbe scenario; use Sea Wolf for active prep.
- Old Ocean Cleanup material is useful for microbe-selection and averaging practice, not for the full current format.
- "Ocean treatment," "microbe game," and "ocean game" are informal labels from older candidate discussions.
What to do next
If you have a McKinsey Solve invitation, use this article only to decode older Ocean Cleanup references. Then move to the Sea Wolf guide for the four candidate-facing steps, timing, and scoring model candidates need to understand.
