Tony Liu, Ling Khor, Jak Heng and Pauline Heng wave as they play the traditional Chinese board game 'mahjong' on top of the Sydney Harbour Bridge during a promotional event in Sydney May 15, 2013, in this picture provided by Bridgeclimb. Sitting 134 metres above sea level, the game was held to promote "The Mandarin Climb" tours during which visitors can climb to the top of the iconic bridge with the assistance of Mandarin-speaking guides. Sydney will also host the World Series of Mahjong from June 2 to 4. [Photo/Agencies]