Hi-Res Adventure #6: The Dark Crystal is a graphic adventure game based on Jim Henson's 1982 fantasy film, The Dark Crystal. The game was designed by Roberta Williams and was the first Hi-Res Adventure directly released under the SierraVenture label in 1983. Versions were published for the Apple II and Atari 8-bit computers. An alternative version of the game intended for younger players called Gelfling Adventure was released in 1984.