What are some awesome, free games for the ipod nano-chromatic?

I recently got a new ipod nano, and i was just like browsing my music, dragging it in, and i was wondering if there were any good games out there in iTunes that are great, fun, etc, that are free? Because almost every game that i saw was only for the iPod Touch, and the iPhone. PLEASE PLEASE HELP! 10 POINTS BEST ANSWER!