Select the Code Entry option at the Extras menu, then enter one of the following codes to activate the corresponding cheat function:

Password - Effect

37437 - All Treasure Maps Unlocked
34743 - Double Damage
24463 - Infinite Chi
23637 - Infinite Copper
94677 - Infinite Health
53467 - Infinite Stealth
54641 - One Hit Dishonor
97831 - Unlocks Character Concept Gallery