Yotsudama

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Yostudama is a carom billiards principally played in Asia, and especially Korea and Japan. It is sometimes colloquially called "four-ball", making it easy to confuse with the similar carom game four-ball.

The game is played with four balls: Two red object balls, one white cue ball, and one yellow cue ball (or sometimes both cue balls are white). Each of the two players is assigned his or her own cue ball. A point is scored when the shooter caroms on both red balls. The shooter is penalized a point for failure to carom on either red ball or if the shooter causes any ball to carom off the opponent's cue ball. Thus, the shooter must avoid any carom or kiss off of the opponent's ball while striving to carom on the two red object balls. A carom on only one red ball results in no points but ends the shooter's inning.