Sonic the Hedgehog

About

Your own REV00 cartridge, which the Sonic Retro disassembly reassembles byte for byte, on mdcore, a Mega Drive core Andrew Nakas wrote under the MIT license.

Sonic the Hedgehog is a 2D side-scrolling platformer developed by Sonic Team and published by Sega for the Genesis/Mega Drive. Players control Sonic the Hedgehog, who can run at near supersonic speeds and sets out on a quest to defeat Dr. Robotnik, a scientist who has imprisoned animals in robots and seeks the powerful Chaos Emeralds.

Description from IGDB.

How it runs

Project

s1disasmDecompilation. The original binary turned back into source code, function by function.By Sonic Retro

Port

andrewnakas.github.ioBy Andrew Nakas · WebAssembly, on the mdcore emulatorOnline since Oct 6, 2026Source: andrewnakas/sonic1-web

Controls

Arrows move, Z, X or C jump, Enter is Start.

Plays with

Keyboard.

You need

Your ROM: Sonic the Hedgehog (USA, Europe), REV00, .md, .bin or .gen, 512 KiB. You pick the file in the port, which opens it in your browser.

Original

Sonic Team, 1991, Genesis