The objective of the game is to swap one gem with an adjacent one to form a chain of three or more gems of the same color. When such a chain is created, the gems disappear, causing randomly generated gems to fall from the top to take the matched gems' place. Sometimes, falling gems automatically line up, causing chain reactions. This is called a cascade. There are several different modes of gameplay available, including various secret gameplay modes that can be accessed by beating levels of Classic, Puzzle, Endless, and Action modes.