List of Sonic the Hedgehog video games - Wikipedia

Sonic the Hedgehog (1991 video game) - Wikipedia

Sonic the Hedgehog - Sonic All-Stars Racing Transformed Guide - IGN

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Sonic the Hedgehog games: Sonic the Hedgehog 3, Sonic Mega Collection, List of Sonic the Hedgehog video games, Sonic Unleashed : Source: Wikipedia: : Libros

Sonic the Hedgehog (lost Winter Consumer Electronics Show 1991 demo build of Sega Genesis/Mega Drive platformer; 1991) - The Lost Media Wiki

Sonic the Hedgehog (lost build of cancelled Sega CD port of Sega Genesis platformer; 1992) - The Lost Media Wiki

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