Original Game
Connect one controller into the fourth Gamecube slot and another controller into the first Gamecube slot. Use Player 1 to reach the end of the cliff in the first level. Hold the "B" button on the second controller and type in A, B, Y, X, Y, A, B, and X on the first controller to open up the original "Prince of Persia" game.
Level Codes
Access the "Password" screen in the original "Prince of Persia" game. Type in "KIEJSC" for level 2, "VNNNPC" for level 3, "IYVPTC" for level 4, "RWSWWC" for level 5, "GONWUC" for level 6, "DEFNUC" for level 7, "SVZMSC" for level 8, "DBJRPC" for level 9, "MZFYSC" for level 10, "BRAYQC" for level 11, "UUGTPC" for level 12 and "LRARUC" for the final Jafar level.
Considerations
If you own "Prince of Persia: The Sands of Time" for Game Boy Advance, you can use a connection cable to attach it to the Gamecube. When the Game Boy loads, you will gain full health in the Gamecube version. Repeat this any time your health is low.
Wii Consoles
The codes will also work if you use the Gamecube game with a Wii console. Click on the "Disc Channel," load the game and proceed with the codes like normal.