The concept of the game is simple. You're presented with five rings that form your board. Different colored balls drop into the outer most ring and will keep going down ring by ring until it gets to the lowest/smallest ring, or is blocked by another ball. You can twist the different rings to maneuver the balls so that you get a complete line of five of the same color that will then disappear.
There are some special balls that come into play that will give you some bonuses like time stoppage, explosives and a wild card.