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.
Disable Arena AI
Enter the following codes at the 'Press Start' or title screen. Enter the 'Extras' menu and select the 'Cheats' option, then press X to activate the unlocked cheat. Press X, Circle(3), X, Square(3), X, Circle, Square, X at the 'Press Start' screen.
Easier Time On Basuku Boss
When fighting the boss on Mount Basuku, head to the two lower balconies on either side of the tower and assassintate the horn blowing enemies there. Once they are dead, you do not need to be worried about enemies attacking you from the back to jeopardize your boss fight.
Full Health Power
Enter the following codes at the 'Press Start' or title screen. Enter the 'Extras' menu and select the 'Cheats' option, then press X to activate the unlocked cheat. Press X(4), Square(4), Circle(4) at the 'Press Start' screen. Health power-ups will all be 100%.
Invincible Rau
Enter the following codes at the 'Press Start' or title screen. Enter the 'Extras' menu and select the 'Cheats' option, then press X to activate the unlocked cheat. Press Square, Circle, X, Square, Circle, Square, X, Circle, X, Square, Circle, X at the 'Press Start' screen.
Stronger Opponents
Enter the following codes at the 'Press Start' or title screen. Enter the 'Extras' menu and select the 'Cheats' option, then press X to activate the unlocked cheat. Press X, Circle, Square(2), X, Square, Circle(2), X, Circle(2), X at the 'Press Start' screen.
Unlimited Arrows
Enter the following codes at the 'Press Start' or title screen. Enter the 'Extras' menu and select the 'Cheats' option, then press X to activate the unlocked cheat. Press X, Circle, Square(2), X, Square, Circle(2), X, Square(2), X at the 'Press Start' screen.
Unlock various costumes from the start
Have a save file from the original game, the Mark of the Kri, to unlock various costumes from the start.
Weaker Opponents
Enter the following codes at the 'Press Start' or title screen. Enter the 'Extras' menu and select the 'Cheats' option, then press X to activate the unlocked cheat. Press X, Circle(2), Square, X, Square(2), Circle at the 'Press Start' screen.