Kingdom Hearts Birth by Sleep is a video game from the "Kingdom Hearts" series for the PlayStation Portable. It has the characters of the Final Fantasy series and Walt Disney characters; for example Donald Duck, Goofy and Mickey Mouse. "Kingdom Hearts Birth by Sleep" starts ten years before the start of "Kingdom Hearts". It was released in Japan on January 9, 2010, in North America on September 7, 2010, and in Europe on September 10, 2010.