Antichamber... Nothing more, nothing less. This game is amazing. I recommend you pick it up on Steam (as that's the only platform it is available on at the moment) for only $19.99!
Although it's hard to explain this game, it's just so fun. Almost too challenging where you'll find yourself walking in circles just as you start to feel you're getting somewhere, you'll want to quit. But intriguing enough in the way it breaks the rules of physical space that we know, so you'll keep going.
I'm not even really a fan of puzzle games, but this... This game is just brilliant. My favorite feature is that there really isn't any tutorial. No "press this", "go here", "do this" and all that. The game actually tells you what you've done after you've LEARNED how to do it YOURSELF. Also, the impossibilities of some of the things in it.
It can't really be explained, it's one of those things you have to experience yourself. So pick it up on Steam for $19.99 and support the developer(s)! Maybe there will be an Antichamber 2? ;P
WARNING: IF YOU DON'T LIKE THINKING, DON'T PLAY THIS GAME.