Braid....

Simply put "Braid is the best 2d platform game ever." There are just three things you need to know about Braid, which is quite remarkable when you think about how many games there are out there which pile on extra levels of needless complexity. First, you should know that Braid is beautiful. Not just pretty, but beautiful. It isn’t like Crysis where you play it for a bit and occasionally go oooh and aaahh at the big explosions, it’s more like looking at a really nice painting or having a dream like the heaven-sequences from What Dreams May Come.The second thing you need to know is that the game is challenging. Again, not in the way that you might have come to expect thanks to a lifetime of shooters and reflex games. Braid manages to stand apart compared to even conventional puzzle games as it requires not just an ability to think laterally, but that you find a whole new way to think laterally. The third thing you need to know is that Braid is excellent. Let’s get that clear from the off – balls out of the bag, so to speak. Braid is phenomenal and you can stab me in the face with a soldering iron if I’m exaggerating about that.
Site: http://braid-game.com/