Prince of Persia: Warrior Within Cheats for GameCube

You need two controllers. Put one in Slot 1 and put one in Slot 4.
On the controller in Slot 4 hold the B button while playing the game.
On the controller in Slot 1 press:
Refills All Sand Tanks (Holding B on Controller 4) X,X,A,B,B,A,Y,Y

Alternate ending:
To view an alternate ending successfully complete the game with all nine Life upgrades.
Defeating The Empress Of Time:
When battling the Empress of Time for the final time avoid all her attacks and do not let her get near the girl in red.
When the Empress of Time has little of her life remaining keep blocking and press Triangle or Square and you will defeat her.