Mario Kart Wii is a kart racing video game developed and published by Nintendo for the Wii console. It is part of the long-running Mario Kart series, featuring characters from the Mario franchise competing in colorful races across a variety of tracks. The game introduced motion controls with the Wii Wheel accessory, online multiplayer through Nintendo Wi-Fi Connection, and new mechanics such as bikes alongside karts, making it one of the most popular entries in the series.