This is sort of electronics, sort of videogame at the same time. Due to advances in technology (and the ability to make things really tiny) this simple looking Genisis/Megadrive controller actually has all the 'stuff' inside to power the actual old console, as well as several games! The headline game on the machine is Sonic 2, but all the games aren't Sonic.
You plug it into your TV, and then have the ability to play any of the games listed on the box, as everything is just built in. This is "volume 2", so there must be another one out there like this...but did it have Sonic?
In 2007, you can find this at Target stores in the USA.