All Weapons and Psionics
While playing a game, press Select to display map. Then, press L1, Square, Triangle, Square, Square, O, Square, O, Triangle. Press Select {sometimes repeatedly} to return to the game.
Submitted by Ruby. 

Invincibility
While playing a game, press Select to display map. Then, press L1, O, O, Square, O, Triangle, X, X, O. Press select {sometimes repeatedly} to return to the game.
Submitted by Ruby. 

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