Cheat Mode:
During play, press ] or + to bring up the console window. Note: Some versions of the game may require Left Ctrl + ] or Left Ctrl + + (the Plus symbol) instead. Type one of the following codes below then press Enter to activate it. Press Esc to close the console window.

Code	Effect
Application:SetGodMode(1)	God mode
Application:FastHeroCast(1)	Cast heroes faster
Application:SetNoManaUsage(1)	Unlimited Mana
Application:GiveMeGoods(99999)	99999 of all resources
Application:SetBuildingFastBuildMode(1)	Fast construction
Application:SetFigureTechTreeMode(1)	Can build any unit
Application:SetBuildingTechTreeMode(1)	Can build any building

Debug Mode:
Press Ctrl + D during play to access debug mode. Hold Ctrl and press W, E, R, or S to toggle the different debug functions.

Thanks to Revolution readers b_jtimmins and DarkPaw!