Participating famous people are Kristen Bell, Sophia Bush, Jonah Hill, John Legend, Snoop Lion, Eva Longoria, Edward Norton and Paul Pierce. Anyone can join any of these "teams" and be entered for a chance to play a game against that celebrity.
For what it's worth, Edward Norton is supremely confident that he'll win for his charity, the Maasai Wilderness Conservation Fund. His first round is against Paul Pierce, captain of the Boston Celtics, who is playing for his own charity, The Truth Fund.
"I think it's great that he has a cause he supports, and I hope the amount he gets from just the first round is going to make him happy because I don't think it's going to go past there," Norton tells The AP. Norton is most concerned about playing against Snoop Lion, citing his experience with wordplay. Norton also lived and worked in Osaka, Japan, after graduating Yale University in 1991, since you seem interested.