First type "oh dear" at the main menu (must be lowercase). Once you've done this, enter the following key combinations during gameplay to activate the desired cheats.
Effect Code Current Weapon is Upgraded Alt + 2 Deactivate All Enemies Alt + 7 End Mission Alt + 6 God Mode Alt + 4 Helicopter Mode Alt + 8 Max Ammo Alt + 1 Max Energy Alt + 3 Speed Mode Alt + 0 Tank Mode Alt + 9 Wow Mode Alt + 5
Contributed By: untrustful.
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