Hi-Res Adventure #6: The Dark Crystal is a first-person adventure with a mix of puzzle and fantasy game from the developers of Sierra On-Line, Inc.. The game is published by presented by Sierra On-Line, Inc.. In some circles, Hi-Res Adventure #6: The Dark Crystal is also called Gelfling Adventure. Hi-Res Adventure #6: The Dark Crystal may be in development for PC, but that version has not yet been announced.