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.
Code Effect Alt + 2 Current Weapon is Upgraded Alt + 7 Deactivate All Enemies Alt + 6 End Mission Alt + 4 God Mode Alt + 8 Helicopter Mode Alt + 1 Max Ammo Alt + 3 Max Energy Alt + 0 Speed Mode Alt + 9 Tank Mode Alt + 5 Wow Mode
Contributed By: untrustful.
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Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.