Also see Gameshark Codes for The Mummy
Cheats - Hard Way
To unlock cheats, complete the game with the following minimal completion percentages.
Cheats - Easy Way
If you don't want to finish the game with completion percentages, you can use these codes instead. During a game, pause, and Quit. Select the "Replay Level" option and go to "Bonus Game Modes". From there, enter the following codes: