Co-op has been a staple feature of many Sonic games for decades now. These examples are the best of the bunch.

Sonic the Hedgehog fans have been left floored after discovering a little-known fact about how one character got its name - ...

Sonic the Hedgehog and his friends have entertained us for decades in video games, TV series, and movies - but people are only just realising how one character got its name ...

All players need to do is keep their "Blast Processing" up. Otherwise, the game's visuals degrade way, way down.