Sonic & Sega All-Stars Racing lets players control five iconic characters from the Sonic universe as they compete in racing challenges. The story revolves around Dr. Robotnik's plan to exploit the power of Chaos, a malevolent being that feeds on the energy of the Chaos Emeralds.
The gameplay is varied among the different characters, each with their unique abilities and objectives. Sonic focuses on speed and destroying robots, while Tails emphasizes hover-based racing and beating opponents to the finish line. Amy's levels involve avoiding capture by Dr. Robotnik's robots and using her giant hammer to break obstacles. E102 Gamma requires precision and strategy to evade its attacks and destroy bosses before time runs out. Big's levels are more relaxed, with a focus on fishing and collecting items that improve his abilities.
Players can visit the Chao Garden to raise and care for baby Chaos, growing stronger animals and potentially entering races against other Chaos. Each level also has additional objectives to complete for extra emblems, although these do not affect gameplay in this version. Historically, players could download online content, including special levels and bonuses, but this feature is no longer available due to the shutdown of SegaNet.