Start the game with the "/cheats=1" command line parameter. Start a single player game and press ~ during a game to display the console window. Enter "sys cheats=1" to enable cheat mode. Then, enter the following codes at the console window to activate the corresponding cheat function:
Result
Cheat Code
Invincibility cheat god
Rare items cheat rare
All upgrades for current character cheat upgrade
Get indicated amount of gold cheat addgold=[number]
Get indicated amount of experience cheat addexp=[number]
Set gold to indicated number cheat setgold [number]
Set level for current character cheat setlevel=[1-255]
Set level for current hero cheat setherolevel=[1-255]
Disable fog of war cheat fogofwar
Set health to 1 cheat damage
View frame rate sys fps
Unknown cheat observer