New Super Mario Bros. Wii is a 2009 side-scrolling platform video game published and developed by Nintendo for the Wii video game console. The game was released on November 11, 2009, in Australia, November 15, 2009, in North America, November 20, 2009, in Europe and December 3, 2009, in Japan. It is the first game in the Mario main series since Mario Bros. to feature simultaneous multiplayer gameplay, and the first title to include Nintendo's new "Super Guide" feature. To highlight the uniqueness of the title, Nintendo chose to use a red keep case instead of the traditional white. The game is also the first Mario sidescroller to have up to four player multiplayer.