Level 4: 5J9DNN1D
Level 5: 5N9XNN1F
Level 6: FSBDP43G
Level 7: 80BJN8B0
Level 8: G4C4N4CK
Level 9: X8MLP4H2
Level 10: VDX2NXGM
Level 11: XK4QNDH4
Level 12: 4PFDN095
Level 13: STFNN8G6
Level 14: NYG4N0F7

Highlight OPTIONS and press LEFT, RIGHT, LEFT, RIGHT, X to activate the cheat options.

Press: X, O, X, O, X, O, R1, R2, L2, L1. You will only be able to do this twice and you have to do them one at a time