Sonic's Timeline SRB2 Message Board

First of all I'll mention I wont count spinoffs as mainline cannon games (Sonic Rush, Mobile Sonic games, Sonic Racing games) I'll count the storybooks as the gameplay has kind of a development of an early boost (although as someone who played them I must say that those boosts were crappy)

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Sonic Robo Blast 2 PSP - GameBrew

Sonic Robo Blast 2 - Speedrun

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Sonic Robo Blast 2: The Cyberdime Realm - Speedrun

Accurate Classic Sonic in Sonic Robo Blast 2

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Xubuntu Games Download - Colaboratory

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Neo Sonic SRB2 Message Board

Ultimate Classic Sonic

Cherribun's Stylized Sonic Model