I should be playing Antichamber right now, but my preview build of the mind-blowing first-person exploration/puzzle game that you can see in the trailer here is... at home.
What's your excuse?
Oh, it's not January 31 yet! That's your excuse.
If you have a PC and access to Steam, you'll be out of excuses on January 31. The game will be out then, price TBD. I'll have played the full game by then and will let you know if it's as terrific as it looks—and still plays as bizarrely and beautifully as it did when an earlier version was shown at PAX a couple of falls ago.