Officially, yes, but, as I said before, I was just a nice try in terms of story, as most events in it don't make real sense and it was used to start the modern trend of plots with game exclusive monsters (fuck you, Forces), weird uses of emeralds powers, etc. It's right modern games had some overarching plot thanks to shadow, but this character is the only one that gets some love from writers, as there's no reason to take Knuckles away of the Master Emerald in Heroes, for example. Anyway, I disregard anything that doesn't link well with the classics as part of the modern illness, such as the weird and wrong time travel in Sonic '06, specially for the emeralds. That's about modern games, but it's not like 3D Blast blends well with previous titles; in fact, it would fit better in the 8-bit alternate storyline, which never had Master Emerald or Super Sonic, and allows for Knuckles to be out of Angel Island. Probably, Sonic X-Treme would have suffered the same fate if it was ever released, as I doubt it would have had Super Sonic in it, and it was meant to have Nack/Fang as an enemy. Sonic the Fighters isa bit out of place here, as any racing game would be (Drift/Drift 2/R). I dare you to be willing to include Tails Sky Patrol, Sonic Labyrinth and G-Sonic on any classic timeline, I dare you twice.