Invincible Rau:
Press Square, Circle, X, Square, Circle, Square, X, Circle, X, Square, Circle, X at the "Press Start" screen. Rau will say "Faahu" to confirm correct code entry. Enter the "Cheats" section at the Sage, and the last card will be Invincible Rau. Press X to activate the code.

Full Health Power:
Press X (4), Square (4), Circle (4) at the "Press Start" screen. Health power-ups will all be 100%.

Unlimited Arrows:
Press X, Circle, Square (2), X, Square, Circle (2), X, Square (2), X at the "Press Start" screen.

Stronger Opponents:
Press X, Circle, Square (2), X, Square, Circle (2), X, Circle (2), X at the "Press Start" screen.

Weaker Opponents:
Press X, Circle (2), Square, X, Square (2), Circle at the "Press Start" screen.

Disable Arena AI:
Press X, Circle (3), X, Square (3), X, Circle, Square, X at the "Press Start" screen.

Weapon Select:
Find each Tuku on all levels to unlock an option at the Sage that allows you to use any weapon on any level.

Arenas:
Successfully complete all of the challenges in a level to unlock that level's arena.

Alternate Costumes and Character Art:
Successfully complete all time attack and body count challenges in an arena to unlock alternate costumes and character art.

Manual Animation:
Flip through the pages of the instruction booklet from the back to the front. There is an animation of Rau performing a stealth kill in the lower right corner.

Turn Kuzo into a Dead Flying Turkey:
Successfully complete the game under any difficulty setting. Start the quest again by getting the mission from the inn keeper (behind the bar with a towel) to kill the bandits in the forest. When you start, you will notice that Kuzo is now Thanksgiving dinner