Board Thread:General Discussion/@comment-26873653-20160723035910/@comment-679780-20160827195904

Well the way I put it explains some things. Sonic Mania is an official Sega game... but is it "canon"? Like, it is part of Sega Sonic's overall lore? If it is, where abouts does it take place?

So my guess is Dr. Eggman has rewritten history. There are two bits of evidence to support this. Sonic '17 trailer depicts Dr. Eggman attacking a city on a scale way bigger than he could acomplish in past Sonic games (Disincluding Perfect Chaos and Iblis which were more flukes of his cause) The other evidence is Classic Sonic's presence in the trailer which further confirms time-travel shenanigans are involved.

For Sonic Generations I personally believe Classic Sonic was from Sonic CD than Sonic 1, given Classic Tails became playable in the modern rerelease of Sonic CD. For Sonic '17 I believe Classic Sonic from Sonic Mania would be present because these two games were announced at the same time and both involve Classic Sonic in unique situations.