Like a Dungeon Master, just less nerdy.
This game was way too much fun! Back then, the concept of playing as a satanic overlord of the underworld was sheer genius. Commanding your minions to upgrade your lair into an impenetrable fortress of doom and horror, and then waiting for those unsuspecting, do-good heroes to come charging in stupidly on their white horses, just so you could pummel them into bloody pulps and string them up on your torture racks...this was hilarious!
Unfortunately, the copy I have won't work when I try to install it on my current, modern computer. PC games, you'll never have the lasting appeal of consoles if you keep these shenanigans up. 1000 points to anyone who can point me in the direction of a working, high-quality, free Dungeon Keeper rom.