The world's first urine-controlled video game has been installed in a London bar.Visitors at the The Exhibit Bar in Balham can play one of three games every time they use a urinal.Gordon MacSween, one of the game's co-founders, said he was not sure how the public would react to the game initially.But as soon he saw it go on trial at a bar in Cambridge he knew he was on to something good.The game was designed to create a valuable media opportunity from the 55 seconds the average male spends while he pees just staring at a blank wall.There is an advert played before and after the game promoting a drink you can buy at the bar.At the end of the game, players are encouraged to post their scores via mobile to Twitter and to a live leader board so they can compete with their friends.The units will be rolled-out in selected venues across the UK in early 2012.