Braid
I feel myself wanting to hold back slightly on this one because there are a great many people out there who have still not played Braid. But, I think I’d be remiss if I didn’t bring up what a brilliant mindf*ck the ending of this game was.
The concept of Braid is sort of a Mario type thing. This dude needs to save his lady love. Or so we THINK that’s the case for the entirety of the game. We come to find out when we finally reach her though that she is actually trying to get away from us. We thought we were trying to save her, but we were the bad guy all along. But wait, there’s more. MUCH more.
For people who delve deep enough, there is no princess. The princess is an atom bomb, which the game’s “hero” created, and the game was a vision in his mind of him wishing he could take back his part in helping to create the bombs dropped in Nagasaki and Hiroshima. I am not kidding. I wish I could make this stuff up.