The free version of Smack A Toon is perfect for stolen seconds during commercial breaks, but definitely not worth paying for.
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BrainTuner is a simple program that challenges you to validate mathematical equations quickly. And yes, its as fun as it sounds.
The addicting console hit, Super Monkey Ball launched with the first barrage of iTunes applications for the iPhone and iPod Touch with over 100 levels and making use of the new accelerometer motion sensor. This game will frustrate you, yet keep you coming back for more.