Just hold down the SHIFT + ~ (tilde) keys together, then a message box will appear in the middle of the screen. Type in any of the codes below (while in Adventure Mode) with the exact number, next press ENTER to add.

Code:                   Effect:
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A. money           Add or Subtract  gold
B. leadership      Adds  amount of leadership
C. doublearmy   Available slots are 1-5, it will double the number of troops in that slot.
                   If you do not choose a slot number, it doubles all your troops
D. magicbook          Gives all Level 1 spells in your spellbook and gives 7 of each spell in scroll form to your inventory!
E. rune            Gives the number  of all 3 runes specified
F. crystal         Gives the number  of crystals specified
G. levelup         If you type a number, it will give you that many levels of experience.
                   If no number is typed, it just gives one level!
H. mana            Increases maximum mana by number specified. If no number is given it only refills your mana rage
            Increases maximum rage by number specified. If no number is given it only refills your rage 
I. spirit          Levels up your spirits (maximum level=30 !!)
J. clearwife          Removes wife and children
K. name         Rename your hero to 
L. boat               Summons your boat if you have purchased one.