Gregopussy: I'm having the same problem. none of the codes work :(
Direke: The reason the "codes" don't work is because the only cheats for Dungeon Keeper require editing the creature.txt file in the game's data folder. By editing this file, I have actually made it to where rooms are free and I get more gold. To do this, you need to scroll down to the rooms and edit the second set of numbers (Ex: scroll to ROOM_TREASURE_ROOM 2 100 200 and change 100 to 0 to make the treasure room free).
Warning: If you alter the wrong entry, you can screw up your game, so make sure to backup creature.txt
before editing it.
For those that do not want to risk editing the wrong entries, I have included pictures of the creature.txt file pasted into excel so I could highlight the numbers you need to change (Also, it's easier to read when formatted as a table instead of a text document).
There's actually a cheat-menu in the game, but it has been disabled. You can use KeeperFX instead, as it has functional cheats and cheat menu's, including skipping/going back to levels, getting creatures, spawning gold, making stuff free, getting access to spells/rooms and making the map visible..