What a good free game on the app store
NYAN CAT LOST In SPACE!!!
Temple Run, Angry Birds, Racing Penguin and Cube Runner are some of the free games that you'll find on the Android and iTunes application stores. The Advent adventure game for iPhone and iPod touch is also pretty cool.
Zombieville and Speedx3D(might be $.99) are great, challenging and very addictive. Can spend hours on.