This ending occurs probably somewhere close to the midway point in the complex web of choices. Stefan, on the edge of a breakdown, is obsessively trying to finish his game. When he snaps and yells at his father, he finds himself at the doors of the treatment centre where he sees his therapist, R. Haynes. After he spots Colin walking by, you have two choices: follow Colin or go see the therapist.
If you pick the latter, Stefan winds up with a heavier dose of his medication, which you can then opt to make him take. If he follows directions, he ends up a bit numbed out, but he finishes the video game. The reviewer on the TV screen gives him an average rating, saying it felt like the game was made on autopilot.
This one's my least favourite because it's so bland and paint-by-numbers. Sure, Stefan maintains his sanity, but at what cost? He doesn't create the game he's been dreaming up for years! This certainly feels like the path of least resistance, and the path of lots of yawns.