You will know if cheats are done properly when a message appears!!

All codes are done while playing the game.

Full Health
R2,R2,L1,R1,LEFT,DOWN,RIGHT,UP,LEFT,DOWN,RIGHT,UP.

Full Armour
R2,R2,L1,L2,LEFT,DOWN,RIGHT,UP LEFT DOWN,RIGHT,UP.

All Weapons
R2,R2,L1,R2,LEFT,DOWN,RIGHT UP,LEFT,DOWN,RIGHT,UP.
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