Sonic the Hedgehog is a series that has existed since the early '90s. The first game introduced only a few ...

it marks the first time Amy and Metal Sonic appear in the series. These events don’t necessarily need to happen before Sonic 2, but since neither Tails nor Super Sonic appear in that game ...

Sonic The Hedgehog 2 and Sonic The Hedgehog 3, of course, feature split-screen multiplayer races. Sonic Rivals and Sonic Rivals 2 on PSP are entirely based around two-dimensional races.