The World Championship of Online Poker (WCOOP) is an online poker tournament series sponsored by PokerStars. It is played on the PokerStars website in September. Established in 2002, WCOOP is PokerStars' attempt to establish the online equivalent of the World Series of Poker. The WCOOP tournament series is the largest of its kind on the Internet. The fifteen WCOOP events in 2005 generated $12,783,900 in prize money, making it not only the biggest ever online poker event, but the third biggest poker series (live or online) in all of 2005.