Cue sports playing nine-ball. Snooker balls are smaller than American-style pool balls with a diameter of 52.5 mm ( in), and come in sets of 22 (15 reds, 6 "", and a cue ball). English billiard balls are the same size as snooker balls and come in sets of three balls (two cue balls and a red, an object ball). Other games, such as bumper pool, have custom ball sets. Billiard balls have been made from many different materials since the start of the game, including clay, bakelite, celluloid, crystallite, ivory, plastic, steel and wood. The dominant material from 1627 until the
World Snooker Championship video games Snooker Championship". The game was developed by Sega instead of Codemasters. The game was also the first released on a handheld console, as the "World Snooker Challenge 2005" on the PlayStation Portable. The game featured a playable "League of Champions" mode, where infamous past snooker matches can be replayed. The game included additional modes such as bar billiards. In "free play" mode, variables such as table size can be altered. World Snooker Championship 2007 was released on 12 January 2007. The box art features John Higgins, Ronnie O'Sullivan and Shaun Murphy. This was the first game in the series to