Sonic 2 sprite edit + Sonic 3D on Sonic 2 pallete by DanielNeris on DeviantArt

Master System - Sonic the Hedgehog - Sonic the Hedgehog - The Spriters Resource

NFG Games Presents - A Sonic the Hedgehog Sprite History

Super Sonic Unleashed Sprite Sheet by khalifax10 -- Fur Affinity [dot] net

New Update] Falling Sprites For All 2.04

Sonic - Sprite Database Sonic, Classic sonic, Sprite database

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Custom / Edited - Sonic the Hedgehog Customs - Sonic (Sonic 1 Beta-Style) - The Spriters Resource

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Sonic The Hedgehog 2 Sprite Sheets - Sega Genesis - Sonic Galaxy.net