Dreamcast gem Jet Set Radio may reappear on Xbox Live Arcade.
The game's logo and name were spotted on the Xbox dashboard by French website Spirit Pixel and picked up by Destructoid.
SEGA has offered Eurogamer "no comment" on whether this is a Dreamcast re-release, a new game or a fake.
Jet Set Radio introduced the world to cel-shaded graphics, while gameplay involved spray-painting Japanese cities and playing music while avoiding police and battering other gangs.