All Items
At the item selection screen, press Square, Square, Square, O, Square, O, O, Left, Up, Down, Right, R2, R2 for all items.
Submitted by Jason_Hemm. 

Level Select
At the level selection screen, hold Select + Square + O and press Right, Right, Right Up, Left, Down, R2 for a level select.
Submitted by Jason_Hemm. 

Restore Health
Pause the game, then hold Square and press Left, Right, Up, Down. For the European/Australian PAL version, pause the game, then hold O and press Left, Right, Up, Down. Note: A perfect score cannot be achieved with the use of this code, as your character will be counted as spotted once in the final score when this code is used.
Submitted by Barry_Hunter and Grand_Master_Tatsumaru. 

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