Return to Dark Castle

The previous games each had 15 levels, and Return to Dark Castle contains all the levels from these first two games plus over 50 new levels. The new areas are a mixture of single-screen levels, in the style of the first two games, and larger horizontally and vertically scrolling levels. The levels contain 25 orbs, 10 of which are required in order to complete the game. Many of the new levels contain secret areas which can be accessed by activating hidden doors and switches.

The gameplay is, with a few notable exceptions, essentially identical to its predecessors. Bryant's principal weapon remains the rock which can be magically upgraded to the fireball, and a magical shield can be obtained. New features include the ability to carry weapons in the player's inventory as well as the ability to keep teleportation potions in the inventory. As he explores the castle, Bryant will also come across additional weapons and defenses that were not available in the original game.

The player fights their way through various areas, inside and around the Dark Castle, in an attempt to defeat the Black Knight. The player's character, named Bryant by default, is the nephew of Duncan, the protagonist of the earlier Dark Castle games. In the game's intro, it is revealed that Duncan never returned from his quest to the Dark Castle. Bryant now approaches the castle in an attempt to succeed where Duncan had apparently failed. Bryant must collect 10 orbs hidden around the castle (similar to the orbs from Beyond Dark Castle) before he can confront the Black Knight.

If Bryant defeats the Black Knight on any difficulty other than advanced, the Black Knight chides him for wanting an ending but expending too little effort. If Bryant defeats the Black Knight on advanced difficulty, the Black Knight's armor is knocked off, revealing Duncan, now old and with gray hair and beard. Duncan and Bryant are forced to flee the castle, as the Black Knight's armor had imprisoned Duncan and now threatens to imprison them anew. Duncan and Bryant descend a rope to the Black Knight's Pier and there board a ship to visit an unnamed destination that Duncan always wanted to see.