All items
At the item selection screen, Hold R + L, press UP, Square(2), LEFT, Square(2), DOWN, Square(2), RIGHT, Square(2), UP, Square(2), LEFT, Square(2).
Increase items(x10)
At the item selection screen, Hold R + L, press Square(3), RIGHT, DOWN, LEFT, UP.
Infinite Items storage
At the item selection screen, Hold R + L + Triangle, press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, release Triangle and press Square(3).
Restore health
Pause the game and press LEFT, RIGHT, UP, DOWN, Square(3).
Unlock demo level
At the start screen, press UP, DOWN, RIGHT, LEFT, X(3).
All items...