By most played it’s Drop Wizard Tower. It’s 65MB, a consistent 15 minute time waster for me. Not the best game; but i kept playing it ever since I broke the world record for fastest climb to the top. I still try to beat my old time; don’t have much luck though.
By best; easily Tap Tap Revenge 3. I remember playing that game on my iPod Touch 2 with 8GB of memory, it should be taking a low filesize. Too bad the game’s delisted on stores, there will never be a rhythm game that good for mobile ever again. Fuck you disney for buying out Tapulous and doing absolutely nothing with them.