Game: Aurifi

Aurifi is certainly the most unique game I've seen yet on the iPhone. Heck, I've only played a game like this once before but that was some obscure Japanese game not even officially released outside their borders. Aurifi is an audio-only game, which means you can play it with your eyes closed. It's a strange feeling when you take your sight out of the game and rely only on your hearing to play. It was a gamble to make a game like that and for the most part it pays off well.