Sony's PlayStation

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Viewpoint

Invincibility:

At any point while paused, press S, S, O, O, T, X, S, U, U, D, D, L1, R1, and SELECT.

Level Skip:

At any point when up against a boss, press S, O, T, R, L, D, R1, L2, R2, and R1.

 lvl | code     lvl | code     lvl | code
 ----+-----     ----+-----     ----+-----
 1-1 | CGG      1-2 | CLL      1-3 | CRR
 2-1 | FGD      2-2 | FLJ      2-3 | FRN
 3-1 | HGD      3-2 | HLG      3-3 | HRL
 4-1 | KGG      4-2 | KLD      4-3 | KRJ
 4-4 | KWN      5-1 | MGJ      5-2 | MLD
 6-1 | PGL      6-2 | PLG      6-3 | PRD