Invicibility:
Press Right, Left, L3, R3, Left, Right, R3, L3 while playing.
Unlock Pumkin Jack and Santa Jack coustumes:
Press Down, Up, Right, Left, L3, R3 while playing.
Thespian Jack costume:
Get an "A" rank on all levels.
Phantom Jack costume:
Get an "S" rank on all levels and complete both secret chapters.
Dancing Jack costume:
Successfully complete the game.
PJs Jack costume:
Successfully complete the game.
Pumpkin King costume:
Defeat the spider Boss.
Santa Jack costume:
Defeat the Doctor.