At the top of the rectangular playing arena, a number of bubbles of various colours are placed in a prearranged pattern at the start of the level. At the bottom of the screen, the player controls the angle of a fixed cannon that fires semi-randomly coloured bubbles in a straight line. The bubbles, when fired, travel in straight lines, possibly bouncing off the side walls of the arena, before eventually coming to rest either touching one or more of the existing bubbles, or at the top of the arena.

If the bubble manages to come into contact with identically coloured bubbles, forming a group of three or more, those bubbles, and any bubbles hanging only from them, are removed from the field of play. As the game proceeds, the top of the playing arena and all the bubbles move down the screen after a certain number of bubbles has been fired. The players must prevent bubbles from passing the base of the arena. Bubbles will fire automatically if the player remains idle.

The two player game pits two players against each other. Both players have an arena each (both visible on screen) and an identical arrangement of coloured bubbles in each arena. When a player removes a large group (four bubbles or more) some of those removed are transferred to the opponent's arena, usually frustrating his efforts at trying to remove bubbles from the arena and prevent bubbles from reaching the base of the arena. A player wins the round when the opponents allows the bubbles to reach the base of the arena.

The game is played as the best of 3 rounds.