Thirded for the track ball. My oldest daughter has been playing Golden Tee, World Class Bowling, Marble Madness, Cameltry (technically a spinner), and Sonic Arcade since she was 3. A trackball also opens up the cab to playing many of the free/educational games on websites like Fraboom.com, NickJr.com, etc. Right now my cabinet gets more Fraboom playtime than Mame.