Deagol submitted this

Posess a creature, press F11, then F12 to bring up a menu of available cheat options. (F11 seems to enter the cheat mode, your screen should flicker to black then back again). After pressing F11, the ALT key in combination with the numbers 1 to 8 will also toggle cheat effects, EG: ALT-8 increases the number of traps you have at your disposal and ALT-1 toggles you into and out of NO COST mode. You may need to experiment with these combinations to determine the exact effects.

[this only works with some versions of the game]

A batch of useful hints?