Crystal Quest is an action game written by Patrick Buckland for the Macintosh and published by Casady & Greene in 1987. It was ported to the Apple IIGS in 1989 by Rebecca Heineman. Ports were also made to the Amiga Game Boy iOS and Palm. It was the first game to support the color displays of the Macintosh II. The game was based on the original shareware game Crystal Raider one of the supporters of which had been Michael Greene founder of Greene Inc. (later to merge with CasadyWare to become Casady & Greene). A sequel similar to the original game Crystal Crazy was released in 1993.