The Mind Sports Olympiad (MSO) is an annual international multi-disciplined competition and festival for games of mental skill and mind sports. The inaugural event was held in 1997 in London with £100,000 prize fund and was described as possibly the biggest games festival ever held. The MSO was the first event of its kind celebrating mental skills and awarding gold, silver and bronze medals for each event and was highly influential on the mind sports movement and competitions that have followed since. The main MSO tournament has been held every year in England.