Press Enter, then type one of the following codes:
God mode: embiggenme
All spells and mana: crazyguy
Flight mode: whoah
Advance to random level: uberload
View frame rate: showfps
Calculate frame rate: calcfps
View debug information: debug
View bounding boxes around objects: boundingbox
Toggle AMD 3DNow! Support: 3dnow!
Toggle landscape: cswire