From Bullfrog Productions:
Use your wit and cunning to obliterate opponents over the Internet in three devious realms. Dig out your dungeon and fill it with workshops, combat pits, prisons, monster lairs, and more, and then watch as your creatures take up residence. Your minions will form your army, research spells for you to use, and line your dungeon with traps (see screen shots
The demo contains everything you need to get a taste for Dungeon Keeper 2. The full game contains many more creatures, rooms, traps, and spells and includes three single-player game modes.
Choose Internet Dungeon Watch when the demo has loaded, and the game will find willing victims for you to play against.