To gain access to that, your mental resistance must be 3 or lower and you must travel between planets. This will slowly raise an invisible stat (indoctrination) which tracks how much control you have lost thanks to ALICE.I'm following the walktrought, but still can't understand how to access to the final challenge #2, any tips on that?
Note that depending on various factors (like, difficulty setting, ship upgrades, traits and so on) you might need to have a lower mental resistance to increase this stat. You get short scenes during travels to let you know your indoctrination is raising when you hit 10, 20, and 30 points (40 points is a game over). You must have 30 indoctrination points or more to get final challenge #2, while challenge #3 triggers between 30 and 20, 20 included.