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Sonic eXtended Genesis, aka Sonic XG, is a Sonic fangame created by Euan "Sir Euan" Gallacher and Joseph "Nitemare" Waters, and has gone through many different variations in the past. Its most recent build was released on August 17th, 2023.
Also known as: Sonic eXtended Genesis
Sonic XG is available on PC (Microsoft Windows).
No — Sonic XG is a single-player game.