Sonic Chaos (Master System prototype; 1993-06-30) - Sonic Retro

Sonic Chaos (May 17, 1993 prototype) - Hidden Palace

Sonic Chaos (Master System prototype; 1993-06-30) - Sonic Retro

US20120017232A1 - Adaptive pattern recognition based controller apparatus and method and human-factored interface thereore - Google Patents

Sonic Chaos (Jun 30, 1993 prototype)

Sonic Chaos (Master System prototype; 1993-06-30)/Comparisons - Sonic Retro

Game Gear - Sonic Chaos - Sonic (May 17, 1993 prototype) - The Spriters Resource

Sonic Chaos (May 17, 1993 prototype) - Hidden Palace

US20120017232A1 - Adaptive pattern recognition based controller apparatus and method and human-factored interface thereore - Google Patents

Sonic Month 2019 - Sonic Retro

Custom / Edited - Sonic the Hedgehog Customs - Sonic (Sonic Chaos May 17, 1993 Prototype, Expanded) - The Spriters Resource

Sonic Chaos (May 17, 1993 prototype) - Hidden Palace

Game Gear - Sonic Chaos - Sonic (May 17, 1993 prototype) - The Spriters Resource