Overview
Nine-ball is played with nine object balls numbered one through nine and a cue ball. On each shot, the first ball the cue ball contacts must be the lowest numbered ball on the table, but the balls need not be pocketed in order. If a player pockets any ball on a legal shot, he remains at the table for another shot, and continues until missing, committing a foul, or winning the game by pocketing the 9-ball. After a miss, the incoming player must shoot from the position left by the previous player, but after any foul the incoming player may start with the cue ball anywhere on the table. Players are not required to call any shot. A match ends when one of the players has won the required number of games.

Number of Players
2

Tournament types supported
Head-to-head

Balls used
Triangular Rack (1-9) plus Cue ball

Object of the Game
See overview.

Racking the Balls
The object balls are racked in a diamond shape, with the 1-ball at the top of the diamond and on the foot spot, the 9-ball in the centre of the diamond, and the other balls in random order, racked as tightly as possible. The game begins with cue ball in hand behind the head string.

Order of Break
Winner of the lag has the option to break. In 9-ball, the winner of each game breaks in the next, unless otherwise specified by the tournament rules. The following are common options that may be designated by players: Alternate break, loser breaks, player trailing in game count breaks the next game.

Legal Break Shots
The rules governing the break shot are the same as for other shots except:

1. The breaker must strike the 1-ball first and either pocket a ball or drive at least four numbered balls to the rail.
2. If the cue ball is pocketed or driven off the table, or the requirements of the opening break are not met, it is a foul, and the incoming player has cue ball in hand anywhere on the table.

Continuing Play
On the shot immediately following a legal break, the shooter may play a "push out". If the breaker pockets one or more balls on a legal break, he continues to shoot until he misses, fouls, or wins the game. If the player misses or fouls, the other player begins an inning and shoots until missing, committing a foul, or winning. The game ends when the 9-ball is pocketed on a legal shot, or the game is forfeited for a serious infraction of the rules.

Push Out
The player who shoots the shot immediately after a legal break may play a push out in an attempt to move the cue ball into a better position for the option that follows. On a push out, the cue ball is not required to contact any object ball nor any rail, but all other foul rules still apply. The player must announce the intention of playing a push out before the shot, or the shot is considered to be a normal shot. Any ball pocketed on a push out does not count and remains pocketed except the 9-ball. Following a legal push out, the incoming player is permitted to shoot from that position or to pass the shot back to the player who pushed out. A push out is not considered to be a foul as long as no rule is violated. An illegal push out is penalized according to the type of foul committed. After a player scratches on the break shot, the incoming player cannot play a push out.

Fouls
When a player commits a foul, he must relinquish his run at the table and no balls pocketed on the foul shot are respotted (except 9-ball). The incoming player is awarded ball in hand: prior to his first shot he may place the cue ball anywhere on the table. If a player commits several fouls on one shot, they are counted as only one foul.

Bad hit
If the first object ball contacted by the cue ball is not the lowest numbered ball on the table, it is a foul.

No rail
If no object ball is pocketed, failure to drive the cue ball or any numbered ball to a rail after the cue ball contacts the object ball on is a foul.

In hand
When the cue ball is in hand, the player may place the cue ball anywhere on the bed of the table, except in contact with an object ball. The player may continue to adjust the position of the cue ball until shooting.

End of Game
A game starts as soon as the cue ball crosses over the head string on the opening break. The 1-ball must be legally contacted on the break shot. The game ends at the end of a legal shot which pockets the 9-ball, or when a player forfeits the game as the result of a foul.