Crystal Castles is an arcade game released by Atari, Inc. in 1983. The player controls Bentley Bear who has to collect gems located throughout trimetric-projected rendered castles while avoiding enemies, some of whom are after the gems as well. Crystal Castles is one of the first arcade action games with an ending, instead of continuing indefinitely, looping, or ending in a kill screen, and to contain advance warp zones. Gameplay Crystal Castles has nine levels with four castles each, and a tenth level with a single castle—the clearing of which ends the game. Each of the 37 trimetric-projected castles consists of a maze of hallways filled with gems and bonus objects and also includes stairs, elevators and tunnels that the player can use as shortcuts. The three-letter initials of the player with the highest score are used to form the first level's castle structure. When all gems in a castle have been collected, a tune of the Nutcracker Suite is played, and the player moves to the next castle. A trackball and jump button control Bentley Bear. Gems are collected by walking over them, and a bonus is given upon collection of the last gem. While collecting gems, there are a number of enemies that try to stop Bentley and/or collect the gems for themselves. Any gems collected by the enemies also result in a lower obtainable score for that screen. Likewise, if the last available gem is collected by the enemy, the player also loses the last gem bonus. Enemies can be avoided by use of the maze and its constructs, or by Bentley leaping opponents via the jump button, in some cases also allowing him to stun them. Some types of enemies will track Bentley's movements in certain ways, while others move at random. If Bentley is touched and loses a life, he "cries out" via a cartoonish speech balloon. If at least 3 lives remain, he says "BYE!"; if 2 lives remain, the quotation is "OH NO!"; if 1 is left, it is "OUCH!"; and finally, for the last lost life (which ends the game), he says "#?!", so as to imitate an obscenity. At the start of a maze, gems are worth 1 point. This increases by 1 for every gem Bentley collects, up to a maximum of 99. Each maze includes a hat or honey pot, which serve the dual purpose of awarding points and