Crystal Castles is an arcade game released in 1983 where the player controls "Bentley Bear" who must collect gems while avoiding enemies. The arcade version is controlled using a trackball, and takes its name from the castles the player inhabits in order to obtain the "Crystals" or "Gems". It is one of the firstarcade games to feature a definitive ending, as apposed to continuing until a loss of lives. The game was both published and developed by Atari, Inc.
The Atari 5200 version of the game, as a casualty of the video game crash of the 1980s, was developed but never released. A working prototype of the game is actively traded between Atari enthusiasts.