Got bored of the Single player game? Got 'The Deeper Dungeons' but the levels aren't that fun!? If the answers to these are yes, then you were in the same boat as me.
To make the game more varied (and more fun) just add " -1player" to the end of the command line for the game. For example... if you select properties for the Dungeon Keeper icon on your desktop (or in the game directory - whichever you use) there should be a "Open in:" box. At the end of whatever location it specifies (and outside of the " marks) just type -1player (with a space separating it from the closing " mark).
If done correctly, when you go into the game, if you go into Multiplayer there should be a "1 Player" option. Click on this and you can choose from LOADS of levels in which you are capable of researching EVERYTHING!