Ubisoft is a large French video game publisher with over 5,000 employees across 17 countries. It is the third largest video game publisher in Europe and fourth largest in America. Some of Ubisoft's most successful franchises include Tom Clancy's Rainbow Six, Assassin's Creed, and Prince of Persia. Ubisoft also publishes many children's games and uses motion controls and 3D cameras in their technology. Just Dance is a popular music game franchise published by Ubisoft, with the first game selling over 2 million copies in its first 4 months and Just Dance 2 improving on the original with new dance modes and custom songs.