High Quality Content by WIKIPEDIA articles! 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. 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 is only available on the PlayStation 2 and Wii video game systems. The PS2 version was not released in Japan. A sequel titled Sonic Free Riders was released on November 4, 2010 exclusively for Kinect on Xbox 360.