This is "An Official Player's Guide to Sonic The Hedgehog" but, it's really for both Sonic 1 & 2 on Genesis & GameGear. It has the Sega stamp of approval, but isn't "the" official guide. It says "Step by step strategies" , but how good is this book? It's by Jason Rich. Likely released right after Sonic 2, judging by the early loook to the cover.