Cheatmode:
 Cheatkeys to press during the play:
 
 Code                          Result
 [Strg]+[Pos1]                 each weapon for an unlimited 
                               period for each shelter
 [Strg]+[Bild on]              the force of gravity by 1 m/s 
                               increase
 [Strg]+[Bild off]             the force of gravity by 1 m/s 
                               reduce