Play Sonic The Hedgehog Open Source Project 0.04A Online in your browser

The game loads when you press Play · press “Play Now” inside the game if it asks.

Sonic The Hedgehog Open Source Project 0.04A

39 plays

Getting to Know Sonic The Hedgehog Open Source Project 0.04A

SEGA Genesis
Platformer
Homebrew
5· 0 votes

Sonic The Hedgehog Open Source Project 0.04A is a fan-made homebrew for the SEGA Genesis that attempts to recreate or reimagine the classic platformer using open source principles. It was released as a public build around the late 2000s or early 2010s, part of the hobbyist scene that kept the Genesis alive through independent projects. The creator is not widely documented in mainstream sources, but the project's codebase was shared on forums like those at spritesmind.net. It's important to note that this is not an official Sonic game - it's an experimental fan work, and as such, it may have rough edges or incomplete content compared to Sega's original.

GAME INFO

Platform: SEGA Genesis
Genre: Platformer
Players: 1
Version: 0.04A
Based on: Sonic the Hedgehog

More Sonic the Hedgehog Games

Ready for another round? Explore more Sonic the Hedgehog games and console editions. Choose a game below to play it on its own page.

How to play Sonic The Hedgehog Open Source Project 0.04A online

Getting Started

Start the game and you'll be presented with a title screen - press Enter to proceed. As a Sonic fan project, the basic loop is the same as the original: control Sonic as he runs from left to right through loop-de-loop-filled levels, collecting rings and stomping on enemies (mostly badniks). The goal of each act is to reach the giant signpost at the end while avoiding spikes, pits, and hazards.

Since this is an early build (0.04A), expect only a small number of zones or even a single act to be playable. You may also notice placeholder graphics, missing music, or unfinished collision - this is normal for a prototype. The physics feel similar to Sonic 1, but slight differences in momentum and air control reflect the homebrew nature. Use the A button (X key) to jump and the B button (S key) to spin dash (if implemented). Collect at least 50 rings and hit a checkpoint to access the special stage if one exists.

If the game crashes or behaves oddly, try resetting the emulator (usually F11 or through the menu). Because this is a fan project without a manual, experimentation is your best guide. The core challenge remains reaching the goal ring without dying - something any Sonic fan will recognize instantly.

CONTROLS

Controls

Arrow Keys: D-Pad / Movement
X: A button
S: B button
Z: C button
A: X button (6-button pad)
Q: Y button (6-button pad)
E: Z button (6-button pad)
Enter: Start / Mode

Sonic The Hedgehog Open Source Project 0.04A FAQ

Is there anything iconic or memorable about Sonic The Hedgehog Open Source Project 0.04A?

It captures the feel of early Genesis Sonic but with an obvious amateur ambition. The project is memorable mainly as a touchstone in the open-source Genesis homebrew community, showing what a lone developer can achieve by studying the original's engine.

Is Sonic The Hedgehog Open Source Project 0.04A considered easy to pick up or challenging?

The gameplay itself is straightforward - run right and avoid danger - but the build is rough. Unfinished level design and occasional glitches can create unexpected difficulty or frustration. It is not as polished as the commercial games.

Does Sonic The Hedgehog Open Source Project 0.04A have a multiplayer or co-op mode?

No. This is a single-player prototype. The codebase is early, and multiplayer was never implemented or planned in this build.

All SEGA Genesis games