The remaining ball is the 8-ball and is a solid black ball. The balls numbered 9 through 15 are called stripes. The balls numbered 1 through 7 are called solids. The game of 8-ball pool consists of playing with 1 white cue ball and 15 numbered balls called object balls. The rules for the game can vary, depending on whether you are playing for enjoyment or want to play pool adhering to each specific rule. One of the most popular pool games you can learn how to play is 8-ball pool.