Bejeweled is a tile matching puzzle game - objective of this game is to swap one gem with an adjacent gem to form a horizontal or vertical chain of three or more gems of the same color. Bonus points are given when chains of more than three identical gems are formed and when two chains are formed in one swap. Gems disappear when chains are formed and gems fall from the top to fill in gaps. Sometimes chain reactions, called cascades, are triggered, where chains are formed by the falling gems.