A video game of the same name was designed by Al Lowe of Sierra On-Line and released in 1986. It was made shortly after the first King's Quest game, so it resembled that adventure in many ways. Along with The Dark Crystal it remains one of only a few adventure games by Sierra to be based on films.
The player character is a young assistant pig-keeper named Taran, who undertakes a quest to stop the evil Horned King, who seeks for Hen Wen, the magical pig of the wizard Dallben, for her visionary abilities. With these abilities, the Horned King would be able to discover the Black Cauldron and rule the land. Taran's first mission is to lead her to the Fair Folk while the Horned King's dragons are looking for them. If the pig should be captured (the game allows either possibility), Taran can go to the Horned King's castle and rescue her. As soon as he is inside, Taran will meet Eilonwy with her magic bauble and may rescue Fflewddur Fflam, as well as discover a Magic Sword. The Cauldron is in the possession of three witches of Morva who will trade it for the Sword. Unfortunately a dragon grasps the cauldron and Taran goes back to encounter the evil man himself. The game actually featured plot branches and multiple endings depending on many variables, such as whether Hen Wen the pig was saved, how the cauldron was destroyed, and what reward was chosen afterwards. This use of multiple endings predated the more famous use in Lucasfilm's game Maniac Mansion by a year.