Ubisoft first jumped into the dance game with Just Dance on the Wii. That franchise has sold over 14 million copies to date. The latest game, Just Dance 2, is being promoted through a sponsorship of Katy Perry 's California Dreams Tour in North America. Perry's "Firework" is featured in the game and Ubisoft is offering gamers a chance to play the Wii game backstage with Perry through a contest.