Invincibility:
Hold RIGHT on the D-Pad, and then press SQUARE, CIRCLE, CIRCLE, CIRCLE, SQUARE, CIRCLE, TRIANGLE, X.
Level Select:
Hold RIGHT on the D-Pad, then press CIRCLE, CIRCLE, SQUARE, TRIANGLE, TRIANGLE, SQUARE, CIRCLE, X.
Weapons:
Hold RIGHT on the D-Pad, and the press SQUARE, SQUARE, TRIANGLE, TRIANGLE, CIRCLE, CIRCLE, CIRCLE, X.