In Usurper, players can work alone or form teams as they explore the numerous dungeons of Durunghins. The goal is to reach the deepest level. Along the way, players can fight monsters -- or one another.
As with most role-playing games, Usurper allows the player to customize his or her character. Players can choose a races from a list of standard fantasy types like humans, elves, and orcs; as well as a profession like assassin or magician.
Unlike many BBS door games, Usurper allows for multiple players to play together in real-time.
Usurper was first released in 1993 by Jakob Dangarden, around the height of the popularity of the similar game Legend of the Red Dragon.