Sonic the Hedgehog 8-bit: Changes from Master System to Game Gear

The Master System needs to be SEGA's next mini-console, not the Dreamcast

Sonic Spinball (8-Bit) - Sonic Spin-offs - Sonic Stadium

Sonic the Hedgehog 2 (8-bit), Sonic Wiki Zone

Special Stage (Sonic the Hedgehog 8-bit) - Sonic Retro

10x V4 Sonic's Master System and Game Gear, with S by Abbysek on DeviantArt

Sonic the Hedgehog (8-bit), Sega Wiki

Converting from the Game Gear to the Master System

Custom / Edited - Sonic the Hedgehog Customs - Sonic (Master System / Game Gear-Style, Expanded) - The Spriters Resource

Sonic the Hedgehog (8-bit), Sonic Wiki Zone