Cheats
Hit the TAB and F11 keys together to enter text entry mode:
Type in "byrne" - this activates cheat mode.
during the game hitting TAB and F3 gives all spells.
TAB and F4 gives all buildings
TAB and F5 gives full Mana.
Choose bonus level
While playing (at any level), press the F12-button and after that press the F11-button. Then you get a demo. If a level passes you want to play, press the spacebar or the enter-button than you play the game from the moment you have chosen.