On the Press Start screen, input A then hold L + R and input DOWN, DOW, RIGHT, UP. The Press Start message will turn green. During gameplay, the following codes and code effects may be input and activated:

Invulnerability ... Hold L and input DOWN, UP, DOWN, RIGHT, RIGHT.
Pevensie Kid Life Restore ... Hold L and input DOWN, LEFT, LEFT, RIGHT.
Accrue $10,000 ... Hold L and input DOWN, LEFT, RIGHT, DOWN.
Clear/skip current stage ... Hold L and input DOWN, LEFT, DOWN, LEFT, DOWN, RIGHT, DOWN, RIGHT, UP.
Unlock All Stages ... Hold L and input UP, UP, RIGHT, RIGHT, UP, RIGHT, DOWN.

If the code input is correct, the phrase Cheat Activated will appear. All codes may be toggled off by re-entry. (Unverified)