Here's what you need to do to unlock Shadow in Sonic Dash

Shadow the Hedgehog/History and appearances, Sonic Wiki Zone

Sonic Dash - The Cutting Room Floor

Sonic Prime Dash - Apps on Google Play

Silver the Hedgehog unlocked in Sonic Dash

Sonic Forces Bonus Edition available for pre-order

Sonic Boom: Shattered Crystal - The Retro Review - Sonic Retro

Shadow (Sonic Dash 2) Sonic Boom - Download Free 3D model by Guilherme Navarro (@guinavarro.al) [109ed43]

Rivals Confirmed for Sonic Boom

Sonic Boom Lost Episodes & Movie » MiscRave

Is Archie Comics cancelling Sonic?

Sonic Boom: Rise of Lyric - The Retro Review - Sonic Retro

Strange, Isn't It? — Captain Shadow from Sonic Dash wearing an eye

Review: Sonic Colors