U.GG 
Icy Veins 
Arcade Cloud 
EV.IO 
Luminosity Tilt to Live Goes Free
Tilt to Live has long had a place on my list of hardest games for iOS, and hardest to put down. It's a great game we called "immensely addictive." Grab it, you won't be disappointed.
Jeff Scott
Jeff Scott is the founder of 148Apps and an app obsessed writer who loves talking apps, games, and the business around them. He knows what real football is, but still insists on calling it soccer.