Sonic the Hedgehog 1 & 2: Sega's Official Player's Guide
From Sonic Retro
This strategy guide is for Sonic the Hedgehog (16-bit) and Sonic the Hedgehog 2 (16-bit) for the Mega Drive, along with Sonic the Hedgehog (8-bit) and Sonic the Hedgehog 2 (8-bit) for Master System and Game Gear.