This is another generic 'remote racer' set, but it's been re-themed to be Sonic & Sega All stars Racing. As you can see amongst all the electronics pages, these figure-eight tracks are a common occurance. They're easy enough to resample, to create repeated releases of the same mechanical item. This time, the cars are little replicas of the vehicles from the game for Sonic & Knuckles. They're obviously not quite in proportion with the figures 'driving' them, & Knuckles' off-road style vehicle has been altered some, to fit the track format as well. They run along the slots in the track, & are controlled via hand-held remotes. The box back says "2 controllers, 2 race cars, 16 track pieces". It then repeats it in Spanish & French. If you don't have a slot racer set, this could be a cool one to collect, as it seems well detailed. 

• Photos by SonicTeam Photos by SonicTeam
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And this...is what it looks like when you open it. You can see the controllers, which have triggers on the tops to control the speed. The interior of the box has the pieces grouped together, & the racers packed securely. This race set is at SonicTeam HQ.