For all of the cheats on this page, the following applies:
L=LEFT, R=RIGHT, U=UP, D=DOWN, O=CIRCLE, X=CROSS, T=TRIANGLE, S=SQUARE, AND L1,L2,R1,R2 = THE SHOULDER PADS, Start and Select are Sart and select (strange that really isn't it?).
Level Codes:
Level 2: S, T, X, O, T, S, O, X.
Level 3: S, X, O, T, T, S, X, O.
Level 4: S, T, X, O, O, T, X, O.
Level 5: X, O, S, X, T, S, X, O.
Level 6: S, O, T, X, O, X, S, O.
Level 7: X, O, S, X, T, T, X, O.
Level 8: X, X, O, T, X, O, S, X.
Level 9: O, X, O, S, X, O, S, O.
Level 10: O, T, O, O, S, T, X, O.
Level 11: X, S, O, X, X, S, S, O.
Level 12: X, X, O, X, O, X, S, O.
Level 13: O, T, X, O, T, S, X, O.
Level 14: S, T, X, O, T, X, C, S.
Level 15: S, T, X, O, S, T, X, O.
Level 16: O, X, O, S, S, X, S, X.
Level 17: O, S, T, X, T, X, O, S.
Level 18: S, O, S, X, X, O, O, T.
Level 19: X, O, X, O, T, T, X, O.
Level 20: T, T, X, O, T, T, X, O