Rad Mobile is a racing arcade game developed by Sega AM3 and published by Sega. It was first published in Japan in October 1990, followed by an international release for arcades in February 1991. Rad Mobile was Sega's first 32-bit game, using Sega's System 32 arcade system board. It was also the first appearance of Sonic the Hedgehog, who appears as an ornament hanging from the driver's rearview mirror.