To activate cheat mode, press I, then type "WINDY". To use a code, press any of the following while playing.

ALT-F1 Access all spells

ALT-F2 More mana

ALT-F3 Destroy all players

ALT-F4 Destroy all castles

ALT-F5 Destroy all balloons

ALT-F6 Heal

ALT-F7 Kill all creatures

ALT-F8 More Spell Experience Points

ALT-F9 Free Spell Usage ON/OFF

ALT-F10 Invincibility ON/OFF

Shift-D Complete current objective

Shift-C Complete level