Cheat mode:
Click and hold the Left Analog-stick and press Black, White, Y at the main menu. A "Cheats" option will now appear at the main menu.
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Developer cheats:
Click and hold the Left Analog-stick and press Black, White, Y(3) at the main menu. This will unlock the "Cheats" and "Developer Cheats" options.
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Mental mode:
Complete the game in Serious mode, then start a new game. Mental will be fading in and out under Serious. In Mental mode, all the enemies will appear and disappear.
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Hidden level:
Destroy all the statues in the Valley Of The Kings level.
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