Ultima: Runes of Virtue II is the sequel to Runes of Virtue. It maintains the action-RPG gameplay of the original. In this game, the Black Knight kidnaps Lord Tholden, simply out of boredom. Lord British sends you, the Avatar, out to recover Tholden and return peace to Britannia.
The Master System port of Wonder Boy in Monster World is somewhat different. It features re-drawn graphics, fewer and shorter stages, and a complex password system (approximately 40 digits in length) rather than battery-backed save data.