Dark Tower is a 1981 electronic board game by Milton Bradley Company, for one to four players. The object of the game is to amass an army, collect the three keys to the Tower, and defeat the evil within. The game came out during the height of the role-playing game craze in the early 1980s.
The rotating window on the tower told you the outcome of your moves. The neatest thing was that you actually had to build an army via mini-quests, you even had to make sure to have enough food, and enough pack animals to carry it all...the list goes on. It was as much fun to play alone as with others.