Tarturian was a follow up to Highlands Computer Service's first game, Oldorf's Revenge. It was largely an expansion of the ideas introduced in Oldorf's Revenge. This was a very early hi-res vector graphics and text adventure game of the same era and style as Mystery House. Intriguingly, Tarturian, like Oldorf's Revenge, allowed you to choose to switch between various types …

The first game released by Highlands Computer Services, Oldorf's Revenge is a black-and-white line graphics adventure/role-playing game. The player can select any of 7 types of characters, which have different powers necessary to solve puzzles. The object of the game is to exit a cave system with a minimum score. The game was originally released as "The Wizard" or "Wizard" …

A black-and-white, line graphics and text adventure, Creature Venture is the third game release by Highlands Computer Services. This time, the adventurer must explore a haunted mansion, rid it of evil creatures, and find lost treasure. Creature Venture was Highlands Computer Services' most successful title.