I can't vote this up enough. If you want a game that makes you think, that has an interesting story (which also makes you think), and which then makes you think

I can't vote this up enough. If you want a game that makes you think, that has an interesting story (which also makes you think), and which then makes you think about both of those in the context of time not necessarily being a linear forward progression, get Braid. Put another way, if you've ever wanted a platformer where you had to think 'Once I flip this switch, I have five seconds to have been over there', Braid is your game.