The code entry dialog is accessed by pressing CTRL-ALT-X

Then enter the following cheats…

cruise control    turns on cruise control
im back              repairs any damage
lock and load        refills ammo
mr fabulous          makes the user invulnerable
moonMoon gravity
mars                    Mars gravity
earthEarth gravity
jupiterJupiter gravity
sampo$999,999
beefcake beefcakeFill weapons and ammo

*Note: These codes only work on players choice mode

Thanks to Revolution readers Daniel Ankrum, Mario Friedmann, Leszek Skorut and

Craig Tabita!