Beyond Dark Castle is a classic platformer for the Macintosh. The game puts the player in the role of Prince Duncan who, once again, must defeat the evil Black Knight through a series of challenges leading up to the final showdown with the Black Knight himself. A colorized Mac version was planned by Delta Tao Software but was cancelled.

This sequel to Dark Castle has our formerly nameless hero now known as Prince Duncan continuing his adventures after he toppled the Black Knight's throne and was dropped by a gargoyle in Trouble 3. With Merlin's help, Prince Duncan finds his way behind the Black Knight's throne where there is a fireplace and mantle. At the start of each new game, Duncan tries to take a torch on the wall beside the fireplace, and the entire wall spins around to reveal a large Ante Room containing 5 pedestals for holding orbs. Your mission is to collect all 5 orbs to open a gate to lead you to a final duel with The Black Knight.