Sonic & All-Stars Racing Transformed

Sonic & All-Stars Racing Transformed is a kart racing game developed by Sumo Digital and published by Sega. It was released for the PlayStation 3, Xbox 360, and Wii U in November 2012; for PlayStation Vita in December 2012; for Windows in January 2013; for Nintendo 3DS in February 2013; and for Android and iOS devices in January 2014. The PS3 and Wii U versions of the game were released in Japan on May 15, 2014.

Sonic & All-Stars Racing Transformed is the sequel to Sonic & Sega All-Stars Racing, and the fourth installment in the Sega All-Stars series. The game was a launch title for the Wii U in North America and Europe. Sonic & All-Stars Racing Transformed received positive reviews from critics, with many praising the character roster and major improvements from its predecessor. It received a nomination for "Best Racing Game of 2012" from GameTrailers, and was nominated for a Golden Joystick Award in 2013 for the "Best Multiplayer" category, losing to Payday 2. Sumo Digital developed a third racing game in the Sonic series, Team Sonic Racing (2019), while the vehicle transformation mechanic featured in Sonic & All-Stars Racing Transformed later reappeared in Sonic Racing: CrossWorlds (2025).