type gonzo opera to enable the cheats
then type
Ctrl+I for invisibility
Crtl+shift+n to go to the next level
Ctrl+a for unlimited ammo
(warning: do not believe the asshole named cheat finder because the cheats he has given are for commandos 1 behind the enemy lines)
If you need more help, we've got more Commandos: Beyond The Call Of Duty cheats and also check out all of the answers for this game
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