Tetris kind of game having for goal to create chains of cute robots holding their mechanical hands. Specialized robots and bonuses are making this game very enjoyable. I also really love the cool music atmosphere.
A competitive multiplayer component would make it even better, but the single-player campaign and Challenge Mode (essentially an endless level) are enough to spend several delightful hours with Robosockets. It's fun, cheap at 99 cents, and looks great on an iPad.