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

Sonic Robo Blast 2 (3D Sonic fangame in development for 20+ years) releases huge new update. [New July 2020 update.], Page 10

Sonic Reclassified (Video Game) - TV Tropes

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

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

Open Assets] - Ova Sonic

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

Sonic Robo Blast 2 - Custom Color addon

Game Jolt - Share your creations

Sonic Robo Blast 2 - The Cutting Room Floor

Sonic Robo Blast 2 Kart

Goo Sonic SRB2 Workshop

Sonic Reclassified (Video Game) - TV Tropes

Lost Stages, Old Demos & More - Exploring the Sonic Robo Blast 2 Iceberg