A sorceress tries to survive the Great Stygian Abyss and rescue a princess in the great first-person role-playing video game (RPG), that was developed by Blue Sky Productions (later Looking Glass Studios) and published by Origin Systems. It was released in March 1992 and is still a lot of fun to play.
In this video the Avatar stumbles across a back entrance to Tyball's lair on the seventh level of the Great Stygian Abyss and faces the evil wizard.
