http://www.netrover.com/~timt/cheats/g/guyspy.html (Amiga Plus Extra No. 5/97, 05/1997)On the options screen, type "GETVONMAXGUY" and press 'F1'. The game will start. Now press 'F1' to advance through the game.
On the options screen, type "ROVENA" and select done. The game will start to load, then give you a level select screen.