You must have the registered version for this to work. 
Set your cheat key by going to the menu (*) and 
setting up your key controls. Then hold the cheat
key (CK) and press these buttons for:


CK+F=Gain Flight
CK+H=Gain HP
CK+M=Gain MP
CK+S=Speed increase
CK+T=Transform into another character
CK+V=Gain invisibility
CK+{or}=Raise or lower level
CK+F12=Kill all living enemies on the scenario
CK+Switch key (set in keyboard controls)