There is a fair and an unfair cheat: Press during the game CTRL, ALT and INSERT at once and continue playing. There is not a sudden effect, let you surprise!
If you are not interested in a unfair cheat, stop reading now. For everyone else: the keys 7, 9, 3, 1 on the numblock direct all monsters at once to move in the direction (in the same order): up, right, down, left. The point is that only the player who is using the arrows can reach the numblock ;-)

Martin Renold: martinxyz@gmx.ch (mainprogramming, publication, gamegraphics)
Jonas Kley: jonas.kley@schweiz.org (menu + translation, a part of the graphics (eg Robots))