Sonic Dash - Prototype Gameplay! Old Game Assets Revealed & Beta

Sonic the Hedgehog (1991 video game) - Wikipedia

Sonic & Friends - 💗 Deliver It To You! 💗 New Animated Shot

Proto:Sonic the Hedgehog 3 - The Cutting Room Floor

KBON- The first intro

All Idle Animations by Sonic Dash(Prototype Version)

LeakWatch: Prototype versions of Sonic mobile games found after

Mega Man Zero - Intro Stage, Hindi Gameplay

Sonic Origins perfectly represents the hedgehog's topsy-turvy career

Sonic the Werehog, Sonic Wiki Zone

Demo – DJMMT's Gaming (& More) Blog

KBON's Sonic News

Sonic R [Prototype/Beta - Saturn] - Unseen64

Hello, I think I may have found a sonic 1 prototype. It's labeled

Sonic Prototypes (released by Hidden Palace), Page 5