First game: The weird unpolished one
Second game: The polished one that everyone remembers fondly with increased variety
Third game: The one with a lot of minigames and stuff that a lot of people seem to dislike, but I tend to think is the most fun one of the trilogy
Happened to Crash Bandicoot, Spyro, Sly Cooper, and Jak and Daxter
Comments
See: every game trilogy ever.
(Also time travel seems popular in the third game...)
Also it has Chemical Plant which is still probably my favorite Sanic level