So now that I’m in a perpetual state of introducing friends to Yu-Gi-Oh, I’m gonna make another post to send all y’all. A lot of this will be a cleaned-up copypaste from a Discord dm, but to start with, if you’re reading this, chances are you grew up with the dub. But forget everything you know about Yu-Gi-Oh from the dub, it was cut and redacted and retconned to be Less Japanese, Less Dangerous, Less Emotional, More Comical/Theatrical and More “Family-Friendly.” They also replaced the entire perfectly-good-very-moving soundtrack to sound More Egyptian, and they cut out a lot of Yugi’s relationship with “Other Me” to be... not as... affectionate.
But if I’m sending you this, I probably already sent you the other post. It’s still pinned when I’m posting this one, so here I’ll just move on to continuity.
Chronologically, the early manga pre-dated the TCG, following more of a featured-game-or-sport-or-toy-of-the-day format, with The Card Game being just another one of them. Back then, it was a lot more feral, being more exclusively a horror series about getting supernatural retribution on bullies, abusers and criminal assailants. This manga got an anime adaptation by Toei widely called season zero, in which Magic & Wizards was renamed Duel Monsters and picked up enough popularity that the author (Takahashi Kazuki) was encouraged to polish the rest of the series to revolve more around it, securing the franchise’s success.
Which finally brings us to the subsequent TCG-era anime adaptation Yu-Gi-Oh! Duel Monsters produced by Konami. This one follows a separate timeline from season zero and would redact characters/events (save for homages here and there), give all the main cast some subtle redesigns (minus Nosaka Miho, who was cut out completely), make the Dark Yugi more ghostly than demonic, and tone down some of the violence but not censor it completely. This is the one that would then get heavily “adapted” by 4kidz for younger-than-intended audiences to watch.
...And then, presumably fitting between seasons three and four, 4kidz commissioned the Pyramid of Light movie and the short spin-off Yu-Gi-Oh! Capsule Monsters, the latter of which may or may not have written a continuity error into the backstory of another major character who was known for operating mostly behind the scenes, and whom was already getting more reveals in the very next canon season. This may be why it didn’t get localized back in Japan while the Pyramid of Light did, making it a 4kidz-exclusive canon.
“I didn’t realize how many canon-branches there were in YGO!”
The fourth season is a filler arc (but it’s unironically my favorite, idc) and widely considered contradictory to earlier and later Duel Monsters lore, but I’d argue that there are ways for both to be true. This arc is also exclusively canon to the anime because in manga-canon, Pegasus J. Crawford was actually Killed Off at the end of the first season. In the anime’s fourth season, he’s involved in the plot again. He also makes a few cameos in GX, but only the first series is actually by the original author, just as with the dothack franchise.
And while that arc corresponds with the anime-exclusive continuity in which Pegasus wasn’t killed off, the manga also got a spin-off dubcanon arc by Ito Akira, called YuGiOh! R, and that one corresponds with the manga-exclusive canon in which Pegasus was killed off.
The fifth and final arc, meanwhile, never got the chance it needed to tie everything together in the way the author would have wanted to. At the time, he was recovering from Almost Dying of Blood Loss, from a Stress Ulcer, which production wouldn’t stop pressuring him to work through, so he wasn’t at mental or physical capacity to continue when he did and was in a rush to conclude the series just to take the break he needed. He’d been stated as having a poor recollection of what he was writing or drawing at the time, and also having a lot of regret over how it turned out. So anyone invested in YGO understands that the final arc needs to be treated as dubcanon too.
Bonds Beyond Time is a movie crossover with the later two series, GX and 5D’s, and that one’s also dubcanon cuz it’s unclear when in Yugi’s or Judai’s timelines they were plucked for this. It’s mostly just there as a nice feel-good movie with the level of art quality fans all envisioned to be uniform for the series.
The epilogue movie, the Dark Side of Dimensions, also follows the anime timeline; but that’s only confirmed by virtue of also acting as a teaser for the game. Duel Links involves multiverse shenanigans (as you do) to cross over all the YGOs, including later series set in AUs and a timeline representing manga canon.
YGO!GX technically follows anime-canon as well, since Pegasus is still alive, and none of the other subsequent series canonically descend from the season zero timeline either.
Yu-Gi-Oh! as a whole is perpetually suspended in a quantum state of dubcanon, but season zero (the Toei series) and Duel Monsters (the Konami series) are as canon as YGO gets, and all other subsequent series effectively teeter further into dubcanon.