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I was having a hard time on one of the levels so I checked out Dungeon Keeper 2 on GameFAQs and apparently there's a cheat mode if you press Ctrl & Alt & C at the same time, but I can't get it to work.

I've tried different combinations of both left and right side keys, but for some reason it's not working.

Am I doing something wrong or does the GoG version of Dungeon Keeper 2 not have any cheats?
hold dow cntrl + alt +c
and you'll hear a soft "clunk"/ door opening sound

then type in the cheats exactly as written ( using _ to denote space-bar)

- for 100,000 mana

- all creatures level 19

- fill all your treasure rooms with gold.

see here for the others
You have to do this in the pause menu and then it will work.
doesn't work at all :(