Toy Commander

Pause the game. Now hold L and enter the following codes. You'll hear music to confirm entry:
Enable all maps      A, Y, X, B, Y, X 
Heavy weapon         X, A, Y, B, A, X
99 heavy ammo        A, B, X, Y, B, A
Fix selected toy     A, X, B, Y, A, Y
Switch machine gun   B, A, Y, X, A, B