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

Tails, who is Sonic's best-friend and sidekick, first appeared in 1992 with the release of the video game Sonic the Hedgehog 2. Tails is a yellow-orange, two-tailed fox whose 'real name' is Miles ...

This game also introduces a new troupe of Eggbots called the Hard-Boiled Heavies for Sonic, Tails, and Knuckles to beat. Mania is considered one of the best Sonic games of the 2010s because of the ...