You've already completed Mass Effect 2 at least once – maybe you've even finished multiple playthroughs. Regardless of how many times you've saved the galaxy, what goes on behind the curtain of Shepard's final mission is shrouded in mystery. You know it's good to the get the loyalty of your crew, but why? What happens if you choose the wrong specialists? Why is Mordin so prone to getting gunned down, even when loyal? We talked to the team at BioWare to get all of the under-the-hood details on how the game determines who survives and who is sacrificed during the course of the game's climactic suicide mission.

Download the image below to see the whole flowchart, and all will be explained. Be careful: spoilers follow!

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