Full Health:
Do not press any buttons during a game for over two seconds, then press Right, Right, Up, Up, Left, Down, Left, Down, X, Circle.

All Items:
Do not press any buttons during a game for over two seconds, then press Right, Up, Down, Left, R2, L2, L1.

Open Exit Doors:
Do not press any buttons during a game for over two seconds, then press Right, Up, Right, Up, Select, Select, Start, Start.

Game Shark Codes

Infinite Money       800DF110 0063 
Infinite Hearts      800DF114 000E

Thanks to Revolution readers Ahmed Shareef, The Thug Lord and Shaun Hughes!