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)

Neon's Sonic 3 Character Recreations & Origins Amy

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

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

Fans Resurrect a Long-Lost Sonic the Hedgehog Game

Sonic Robo Blast 2 v2.2.9 Save Files - The Independent Video Game Community

Sonic (SRB2) Minecraft Skin

Sonic 3D SRB2 Workshop

SRB2 aim thok assist

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

Fans Resurrect a Long-Lost Sonic the Hedgehog Game