Blackball (sometimes written black ball or black - ball) is a pool (pocket billiards) game. It is called blackball as opposed to 8 ball to distinguish it from the. Black ball is played with 15 colored object balls and the cue ball. The object balls are two groups of seven and the black ball. The player or team pocketing their. The following is a comprehensive visual guide to blackball pool rules as sanctioned by the World Pool -Billiards Association (WPA) and as played throughout the.