A game quite similar to Boulderdash. You must navigate a maze of boulders suspended by earth, and crystals. The goal of each level is to find the key which unlocks the exit. There are also alien monsters that hatch out of eggs if they are disturbed - and spirit-like monsters that stick to the walls of the maze until they get to a cage which they go in and turn into crystals. There is also a crown on each level.
The game had level packs, each with a different art style. For example there is an old west pack where the boulders are replaced by wagon wheels, and the alien monsters are bandits.