Pushmo yet? You should check it out. It's only seven dollars on the e-shop right now, and if it weren't for a portable version of Street Fighter IV, Pushmo would be my most played game on the system at the moment. It's difficult to explain what I like about the game so much: it's a 3D puzzle game with simple controls and mechanics that remains enjoyable even at the higher difficulty levels. It's the sort of game I can play for a bit, come to a logical end, and go back to something else (drawing, vectoring, or trying to get the timing down on Fei Long's Rekka combos).