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

US20150204559A1 - Adaptive pattern recognition based controller apparatus and method and human-interface therefore - Google Patents

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

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

Sonic The Hedgeblog — One of the prototype screenshots shown in SEGA

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

Sonic The Hedgeblog — From @HiddenPalaceOrg's May 17, 1993 prototype of

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

Sonic Chaos (1993), Master System Game

Sonic Chaos (May 17, 1993 prototype)

Sonic Chaos (Jun 30, 1993 prototype) - Longplay