Dark Earth

Press [P] to pause the game, type the code (case-sensitive) and press [Enter].
Easy Mode must be entered first to enable the other codes.

fortytwo : Easy Mode (enables other codes and cheat keys)
dwarf : Small character
baffe : Big hands
bigfoot : Big feet
bighead : Big head
normal : Normal character
muchbetter : Arkhan relieves himself

Cheat keys:
[Ctrl]+[D] : Refill Arkhan's life gauge
[D] : Decrease opponent's life to 1

(Information from Cheat Machine)