I'm also so autistic that I've beaten every Sonic game except for the PS2/Wii version of Unleashed, and the handheld versions of Colors and Generations. I'm workin' on that now. I didn't do them all in order because I've been playing them since before I can remember, and a lot of the games are ones I wasn't even aware of when they came out (like some of the Game Gear games, for example). When I realized I was very close to beating every game in the series, I also went and read every Sonic comic and manga, except for some chapters of a manga from 1992 that seem to be lost media. Only a few chapters had fan translations, so I used Google Translate to read the rest that I could find. Overall this adds up to about 1000 issues/chapters. And of course that meant I had to watch all the tv shows as well. I then made a massive spreadsheet where I tried to place every piece of Sonic media in their most logical order, with notes on the minimum changes required to make stories from vastly different universes make sense together, with games taking priority, then movies, then tv shows, then comics.
For example, everything goes in release order except for things that obviously take place earlier in the timeline, like how the first Sonic movie is Sonic's first known adventure, and the first time he meets Eggman, so it takes place before Sonic 1. The manga with the lost chapters is the first appearance of Amy (and Charmy), and the last story is a Sonic CD adaptation. So most of the manga takes place before Sonic CD. Now, the trick is that in the manga Sonic is a regular hedgehog kid who transforms into Sonic under stress, and nobody knows he's Sonic, including himself. He also has a whole family. I think you'd need a whole framing story to be made up and justify trying to explain this. It's too different. But what sort of framing story could be used to mash this into continuity? I'd say that Sonic hit his head or something and got amnesia, and didn't remember he was a hero, so this guy he saved took him in and pretended to be his dad, so Robotnik wouldn't come and get him. And then he blended in and got a girlfriend (Amy) and basically all the events of the manga can then happen unchanged. Then eventually he gets his memories back. Actually, in the last few stories, Sonic's regular kid identity is never mentioned, and I'm not sure if he already got his memory back in one of the final chapters that is missing. (Amy does discover that Sonic and Nicky are the same guy in one of the final stories.) I'd have to hunt down some old manga to confirm. Otherwise, he just gets his memory back after the manga, then Sonic 2 happens or whatever.
Sometimes you have to go quite far out of release order, because there are extended periods in both comics where Robotnik is dead and/or Sonic is lost in space/another dimension, so you can't go mixing stories from different continuities in those eras, but I strived to move things from release order as little as possible. I think I made it work pretty well.
Adaptations take place as close to the games they're adapting as possible, in release order relative to each other, unless there are particular story reasons to do otherwise. For example, Sonic movie 2 loosely adapts Sonic 2 and 3&K, so it takes place after those, except Sonic 4 canonically is Eggman's next appearance after Sonic & Knuckles, so Sonic movie 2 takes place after that. The movie can mostly happen the same except it isn't the first time Sonic met Tails or Knuckles. Knuckles just got tricked by Eggman again, which happens all the time anyway. In a more complicated example, the Archie comics, Fleetway comics, and Sonic X all adapt Sonic Adventure. Most of the Archie adaptation actually takes place before the events of the game (when Chaos gets released and all that), so those parts take place earlier. Sonic X, however, places all of Season 1 before its Sonic Adventure adaptation, but doesn't lead into it as directly as the Archie adaptation does, so Sonic X Season 1 takes place before the Archie Sonic X adaptation. Sonic X's adventure adaptation is pretty accurate but just condensed, so you can treat it as the same story and just say the game version is the "real" version, and you wouldn't lose anything from the show. But the Archie adaptation adds subplots about Antoine and Bunnie in Station Square, and Knuckles's dad teaming up with the Chaotix and meeting Big's tribe of cat people in the jungle. Now, Knuckles' dad cannot be canon to the games, it contradicts things too hard, but we can still say The Chaotix went and met the cat tribe in the jungle around the time of Sonic Adventure, and we can say Antoine and Bunnie did stuff in Station Square that just wasn't seen in the game. Of course, the Archie adaptation also adds a bunch of retarded lore about how Station Square is hidden in a volcano and the sky you see from there is fake. Fuck that shit. None of it can mesh with the games so that would just be ignored and made not canon, but most of the story could still be kept. The later Archie comics actually did have the timeline change, so this is canon in the last 50 or so issues (100 if you count Sonic Universe). The Fleetway Adventure adaptation, meanwhile, is so different from the game that you can just treat it as a whole separate story. But since it is intended to take the place of Sonic Adventure, but came out after, it is set immediately after Sonic Adventure in the timeline.
The adaptations also help to find when stories are supposed to take place. So the Fleetway and Archie adaptations of Chaotix came out sort of far from each other, but we can tell that stories before were intended to take place before Chaotix, and stories after were intended to take place after. So even though their release dates are different, they go in the timeline as close to each other as possible (in their own relative release orders, though), and the stories that precede and follow them do so together. And of course relative to the games, they both just take place immediately after Chaotix. (Actually, Tails Skypatrol and Sonic Labyrinth take place at the same time as Chaotix, but that's deep Japanese manual lore and I'm pretty sure I'm the only person who knows about it.)
There's also a very interesting particular issue of the Archie Sonic adaptation that really looks like it was meant to make things line up with the final episode of the Sonic Saturday Morning cartoon, so those two stories go together, but even though similar events happen, they're treated as different stories, because they're also too different to pretend they're exactly the same thing. But the point is that after both those stories, the status quo would be the same in both continuities, so they go next to each other in the timeline.
The Archie adaptations of Unleashed and Fighters came out many years after the games and thus weren't tie-ins, so rather than placing them near the games, they just are new stories that take place after. Sonic turned into a werewolf again. Whatever. The Fighters adaptation is so loose that it's barely the same thing anyway. However, in this era, they also do multiple flashbacks to Sonic 2 8-bit, only the events are slightly different, because they include Scratch, Grounder, Coconuts (the Super Special Sonic Search and Smash Squad from Adventures of Sonic the Hedgehog), and Breezie the Hedgehog, that one girl that tried to molest Sonic in that one episode of Adventures of Sonic the Hedgehog ("That's no good!"). Also the flashbacks include Ixus Naugus from the Saturday morning cartoon, and Witchkart, from Tails Skypatrol. Naugus has crystal powers, and the secret final level from Sonic 2 8-bit is Crystal Egg Zone, so say Naugus crystallized an Eggman base, thus creating Crystal Egg Zone. However, not only does this already change the game a lot, but Naugus should be locked in another dimension in this era. Yeah, history was changed in the comics, so apparently Naugus just got out at a wildly different time than he originally did, but that makes far more comics non-canon than they really need to. So instead I'd say that this event wasn't literally Sonic 2 8-bit, but another time Robotnik just used some old (or similar) robots to do a similar plan again, but with the addition of the S6 Squad and Breezie, and Naugus and Witchkart showed up. The earliest place this can take place in the timeline is many years later, but I found a place, in the mid-2000s. So fuck it.
Sonic Underground takes place shortly before Adventure (and its adaptations), but there would need to be an added story at the end (the show never did get a finale). The ending would need to involve Queen Aleena and the Oracle of Delphius admitting that they lied to Sonic and he isn't really a prince. But he is a chosen one (he already is in the games) so they had to lie to him to get his help. But now he's like a spiritual brother to Manic and Sonia. And the fourth member of The Council of Four isn't really Sonic, it's Uncle Chuck. Also, they're the real royal family of the kingdom, but Aleena left Sally's dad as a Steward due to the Oracle's prophecy of Robotnik. When Aleena comes back, though, Sally's dad remains king, and The Council of Four takes on a higher ceremonial/spiritual position. She's like the pope.
Oh yeah, the Archie comics changed history after issue 252, but I noticed there were some times things changed more than was really needed. Sure, don't reference all the comic OCs anymore, but there was no real need to change Naugus's backstory, since that was from the TV show. I think I could make it work so that the later stories could match with the earlier ones, with enough autistic thought about the timeline.
The games also didn't all come out in release order. Sonic 2, 3, Knuckles, and Sonic 4 all take place directly after each other, so games that came out between them take place before or after. Sonic Chronicles ends on a cliffhanger that was never resolved. But it can all work, so long as you're autistic enough.
Anyway, here is the spreadsheet. I haven't updated it in several months, I'll finish it once I finish these last few games. Gotta add the last few entries, and I'm sure I could clean up what I already have, but I don't think it's missing anything major at this point.