By gaining gravity points through tricks and technical challenges, players will enter a zero-gravity zone and be able to perform new moves. This game introduces many new abilities in addition to ones from the first game. This sets off a war to decide who gets the artifact, leading them to settle their dispute by having an Extreme Gear competition. Along the way they discover surprises, including the Babylon Rogues, a group of avian thieves who are also after the artifact. They set out to retrieve a legendary artifact that has the ability to control gravity. Sonic, Tails, and Knuckles are alerted to robots that are attacking a famous city of the future.

Following the format of Sonic Riders, Babylon Story also includes an epilogue that expands past the Heroes Story. Although the stories start separately, they overlap each other, telling the story as the main characters within that story see it. The Story is split into two halves, the Heroes Story (Team Sonic), and Babylon Story (Babylon Rogues). A sequel titled Sonic Free Riders was released on Novemexclusively for Kinect on Xbox 360.

The PS2 version was not released in Japan. Sonic Riders: Zero Gravity is only available on the PlayStation 2 and Wii video game systems. It is the fifth racing game in the Sonic the Hedgehog series, following Sonic Drift, Sonic Drift 2, Sonic R and its predecessor, Sonic Riders. Sonic Riders: Zero Gravity released in Japan as Sonic Riders Shooting Star Story ( ソニックライダーズシューティングスターストーリー, Sonikku Raidāzu Shūtingu Sutā Sutōrī ?), is a hoverboard racing video game published by Sega and developed by Sonic Team in cooperation with NowPro. Tomonori Sawada (Sound Director/Sound FX) Kenjiro Morimoto (Producer/Director/Game System Design)

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