Use the arrow keys to move and space bar to jump or use the mouse to move and left click to jump.
The player controls a cartoon bear by the name of Bentley Bear, who has to collect gems located throughout the castles while avoiding enemies out to get him as well as the gems.Enemies can be avoided by use of the maze and its constructs, or by making Bentley jump over opponents with the jump button, in some cases also allowing him to stun them.Crystal Castles has nine levels with four castles each, and a tenth level which features a single castle — the clearing of which ends the game. Each of the 37 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, the player moves on to the next castle.