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)

Sonic X-treme, Sonic Wiki Zone

SAGE 2022 - Demo - Sonic Robo-Blast! From The Past (SAGE 2022)

Sonic Robo Blast 2 PSP - GameBrew

sonic adventure 1997 prototype v2 (real) : r/SonicTheHedgehog

Full Interview with SonicFreak94 (SADX modder, Lantern Engine and SA2 Battle Network developer) – ARCADEX MACHINA

Mi ni Ikuzo! Hedgehog - ScaleyFoxy

Sonic Robo Blast 2: Shut Up and Get On It - Speedrun

Release] Sonic Robo Blast 2 for New3DS, Page 3

Sonic Robo Blast 2: Shut Up and Get On It 2 - Speedrun

Sonic Robo Blast 2 (3D Sonic fangame in development for 20+ years) releases huge new update. [New July 2020 update.], Page 4

sonic adventure 1997 prototype v2 (real) : r/SonicTheHedgehog