Spelunx and the Caves of Mr. Seudo is a 1991 educational computer game designed by Robyn and Rand Miller, best known as the creators of Myst. Spelunx has no real story, and is meant as a game to be explored and played with rather than completed. Other than the player, there are two main characters, Professor Spelunx and Mr. Seudo, who are pictured but never actually meet the player. Robyn Miller hand-drew all of the graphics in the game.