While playing the game, press CTRL+ALT+C, then type: 

NOTE: Pressing CTRL+ALT+C will NOT generate a text box, it will simply make a 
noise. Type the codes below (with spaces where noted) and even though it will 
appear that it is not recognizing your codes (by still showing hotkey movement, 
etc), it does. Remember that cheats may not work with all versions of the game.

					
Code 					Result	
show me the money			Gives Money	
now the rain has gone			Show Map	
feel the power				Upgrade All Monster's Skill to 10	
this is my church			Get All Rooms	
fit the best				Get All Rooms and Traps	
i believe its magic			Get All Magic	
do not fear the reaper			Win Level	
ha ha thisaway ha ha thataway		+100,000 mana (Works with latest patch)	

Temple Sacrifices: 
Sacrifice				Result	
2 Salamanders				1 Dark Mistress	
2 Rogues				1 Salamander	
2 Warlocks				1 Goblin	
2 Bile Demons				1 Rogue	
2 Black Knights				1 Vampire	
1 Salamander + 1 Dark Elf		1 Dark Mistress	
2 Skeletons				1 Dark Elf	
2 Wizards				1 Bile Demon	
1 Skeleton + 1 Troll			1 Bile Demon	
2 Dark Elves				1 Troll	
2 Vampires				1 Bile Demon	
2 Dark Mistresses			1 Skeleton	
2 Trolls				1 Warlock	
3 Monks			  	Mana Boost	
1 Bile Demon+1 Warlock+1 Dark Elf	Receive Imps	
2 Dwarves + 1 Dark Mistress		Make Safe	

Load Any Level: 
Just start dk2.exe with the parameter -level (levelname)
EX: dk2.exe -level level10 You can view all levels in 
your "DK2DIR\DATA\EDITOR\MAPS\" directory.
The Campaign levels are named form Level1 -> Level20 

Exeptions are:
In Level 6 you have "level6a" or "level6b"
In level 11 you have "level11a", "level11b" or "level11c"
In level 15 you have "level15a" or "level15b" 
The Secret Levels are named from secret1 -> secret5 


Bonus Stage
There are several bonus stages in Dungeon Keeper, but one of them can be found 
without doing anything. To access it, set your PC's date to any day with a full 
moon then start the game. The bonus stage will appear as a flag with a circle 
in it. 

Modify Cheat
Go into the data file, then open up the creature file and you can change 
information about creatures and spells around. Ex: You can change the imp
spell to where imps cost nothing.