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)

Fans Resurrect a Long-Lost Sonic the Hedgehog Game

Sonic's Timeline SRB2 Message Board

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

Sonic: Lock & Load » Index

Tyson Hesse Sonic SRB2 Message Board

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

The best Sonic fan games

Sonic Robo Blast 2 - Speedrun

Sonic (SRB2) Minecraft Skin

Release - Sonic Robo Blast 2 Official Pyra and Pandora Site

Ultimate Classic Sonic

Cherribun's Stylized Sonic Model

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

SRB2 - New Mods and Hey this game is getting interesting again! - Sonic Chat - Sonic Stadium