During play, press 'F1' to pause the game, then type "RHIANNON".
Then press one of the following:

             'F9'__________________________Invincibility.
             'F8'____________For keys, spells, and money.
             'F7'___________________________Select level.
             'F6'____________________To appear in a shop.

(If you want more stuff you'll have to retype "RHIANNON" and press
the desired key)