Released November 7, 2006 by drx. Based on Nick Arcade show's Sonic 2 build. Only Genesis cartridge with holographic label. Contains many Sonic 1 remnants like level names and music
Hidden Palace released a prototype of Sonic Genesis on January 1, 2021. Prototype was discovered by Buckaroo in late 2020. Originally sent to UK magazine in early 1991 for pre-release coverage
First BMW M8 prototype developed in early 1990s based on E31 8 Series Coupé. Prototype remained secret for almost two decades until 2010. Never produced as production model but would have made global impact
Created around mid-1992 for Sega Mega Drive. Named after Simon Wai who found ROM on Chinese website. First prototype discovered, referred to as "Sonic 2 Beta". Presented to Western Sonic community in 1999
Prototype built in October 1993 for Sega Mega Drive. Contains programming for removed content from final game. Features references to Star Trek: The Next Generation. Includes leftover data from various Sonic 3 builds
Simple RPG where players eat through food-themed dungeon. Prototype v0.1 aims to test concept and collect feedback. Game features weight gain and monster fighting mechanics