Hi there,

(1) In plant defense game, how is the route of the intruding species decided when there are multiple possibilities with the same length?  (and number of turns)?

Normally they take the fastest path. If you put a cliff (blocking the path), they will change it for the next fastest one.

(2) Are the extra turns induced by the 'slowing terrains' counted as extra length when the routes are decided? (or is the length of the route solely based on the number of squares?)

If you mean in terms of terrains you add during the game: the only terrain that should change the path of an invader is the cliff (which is blocking the path overall).

(3) In the ecosystem building game, how is the eating order determined when there is a tie in the calorie provided (for the predator) ? (I could only find description of rule regarding a tie for food sources)

Theoretically the two predators would eat at the same time. I never heard of such a case in an actual game though.

You can also find an article on the game below with a few tips:

▶ McKinsey Problem Solving Game Article

If you want to prepare further, you can find below a video simulation with:

• 15 videos showing how to crack the Ecosystem Game in 23 minutes (instead of the recommended 35) and resist 25+ turns in the Plant Defense (instead of the minimum target of 15)
• Automated Excel with Formulas to build a food chain in the Ecosystem game in 16 minutes
• PDF guide with all the 6 games and how to crack each of them

You can check the video simulation at the following link - full disclosure, I am the author ;)

▶ McKinsey PSG Solve Combo Guide

For other questions please feel free to PM me.

Best,

Francesco