Its an XBL Arcade game. I think it was 800 points to download. It's really good. You gotta manipulate time in order to solve the game. Its one of the best arcade games I've ever played. Ranks right up there with the original Zelda and Mario games. It could take your weeks to beat the game, or you could beat it in one sitting. Some of the worlds are quite difficult to solve. I recommend it to everyone.
I bought it when it first hit XBL. WOW... What an awesome puzzle adventurer. VERY hard later on in the game though.
I absolutely loved this game when it came out ... gameplay, visuals, and soundtrack are all top notch. The last world is a work of art. Completely awesome.