In the ENGLISH VERSION: type "GONZO1982" during the Game.
Now you have following Options...
| SHIFT+V | Invisible to Enemy |
| SHIFT+X | Tele-transport. (look with your mouse for a place for your Figure) |
| CTRL+I | Invincibility |
| CTRL+SHIFT+N | Finish the Mission |
| STRG-I | God-Mode for Soldiers |
| STRG+SHIFT+N | Win the Mission! |