Sonic the Hedgehog: Official Game Guide, Sonic Wiki Zone

Sonic the Hedgehog: Official Game Guide is a strategy guide book published by Prima Games in the United States for Sonic the Hedgehog (2006).

Team Sonic, Sonic Wiki Zone

Sky Base Zone - Sonic Retro

Sonic the Hedgehog (character) - Wikipedia

Sonic Advance — StrategyWiki Strategy guide and game reference wiki

Sonic the Hedgehog/Green Hill — StrategyWiki

Sonic the Hedgehog Genesis, Sonic Wiki Zone

Sonic Adventure 2: Battle Strongest Strategy Guide

Sonic Spinball - Wikipedia

Sonic the Hedgehog Modern Style Guide, Sonic Wiki Zone

Green Hill Zone - Wikipedia

Zone: 0 > Sonic 1 > Green Hill Zone

Sonic the Hedgehog Modern Style Guide, Sonic Wiki Zone

Sonic the Hedgehog 2 – Wikipédia, a enciclopédia livre

Sonic the Hedgehog (promotional comic), Sonic Wiki Zone