Sonic & All-Stars Racing Transformed is an upcoming racing video game being developed by Sumo Digital. It is a sequel to 2010's Sonic & Sega All-Stars Racing. The game will be published by Sega for Microsoft Windows, Nintendo 3DS, PlayStation 3, PlayStation Vita and Xbox 360 in late 2012.
See also: Gameplay in Sonic & Sega All-Stars Racing
Like its predecessor, the game is a mascot-based kart racer, although it features many new mechanics and improvements from the last game. The most notable new mechanic is that the vehicles now have the ability to transform into sea and air-based vehicles during a race, and the racetracks in the game now terraform as players proceed through them, in a manner similar to games such as MotorStorm: Apocalypse and Split/Second. For example, one of the tracks in the game, a course based on Panzer Dragoon (a new addition to the Sega Superstars series), features one of the titular creatures destroying a bridge, forcing players to continue the race in the air. They may also opt to continue the race by dropping into the river below and transforming into a boat. The player does not completely decide when they transform; this is mostly decided by the game. Transformation is done by passing through brightly coloured "transformation gates" or coming into contact with the surface of water. Courses feature branching paths in which players may opt to choose whichever vehicle mode offered to them that they prefer.
The car mode handles similarly to the previous game. Players can earn boost in this mode by drifting and performing tricks in the air. The seafaring mode of the vehicles features true boating physics, similar in style to other watercraft racing games such as Hydro Thunder and Wave Race 64. Players in this mode are heavily affected by the water's turbulence, and can leap into the air off particularly large waves in order to perform stunts and receive speed boosts. Finally, the aerial mode features simple and intuitive flight dynamics; ascending slows players down while descending speeds them up. They may perform techniques in the air such as aileron rolls and tilting along the roll axis for tighter cornering.
All-Star abilities from the previous title return, but are no longer obtained through item boxes. Instead, players gradually fill up an "All-Star meter" by performing tricks or collecting stars scattered around the courses; when the meter is full, players may use their All-Star Move whenever they wish. Players who are further behind in the race will build up their All-Star meter more quickly than those in front. Additionally, unlike its predecessor, All-Star Moves can now be used in online multiplayer.
The game will feature a new single player adventure mode, where players can unlock new characters. Vehicles can also be upgraded with ranks and modifications using XP gained by building All-Star meter. The game will feature 16 new tracks inspired by games like Super Monkey Ball, Panzer Dragoon and Golden Axe, as well as four returning locations from the first game. The game will also feature online multiplayer in all versions.