Rise of the Kasai Cheats

Enter these codes at the title screen that says "Press Start." A sound will confirm the entry. Then got to the Sage at the back of the Inn and enter into the "Cheats" section. Then press [X] to activate the cheat you've unlocked:

[Square], [Circle], [X], [Square], [Circle], [Square], [X], [Circle], [X], [Square], [Circle], [X] - Invincible Rau
[X], [X], [X], [X], [Square], [Square], [Square], [Square], [Circle], [Circle], [Circle], [Circle] - Full health power
[X], [Circle], [Square], [Square], [X], [Square], [Circle], [Circle], [X], [Square], [Square], [X] - Unlimited arrows
[X], [Circle], [Circle], [Circle], [X], [Square], [Square], [Square], [X], [Circle], [Square], [X] - Disable arena AI
[X], [Circle], [Square], [Square], [X], [Square], [Circle], [Circle], [X], [Circle], [Circle], [X] - Stronger opponents
[X], [Circle], [Circle], [Square], [X], [Square], [Square], [Circle] - Weaker opponents

Alternate Costumes
Get a memory card with a saved game from The Mark Of Kri on it and insert it into your PS2. You will now be able to start Rise of the Kasai with six alternate costumes already unlocked.