About Sonic Mania
The acclaimed retro-style Sonic adventure with remixed classic zones and new levels.
Sonic Mania (2017) is a love letter to the Mega Drive Sonic games, made by fan developers working with Sega. It mixes remixed classic zones with brand-new ones, hand-drawn pixel art and fast, physics-based platforming.
Play as Sonic, Tails or Knuckles. The browser build is an unofficial web port: loading can take a while, and a keyboard and mouse are recommended.
Available browser projects
Sonic Mania at a glance
- Genre
- Platformer
- Original release
- 2017
- Developer
- Christian Whitehead, Headcannon, PagodaWest Games
- Publisher
- Sega
- Browser version
- gn-math.dev
- Price
- Free
- Download
- Not required — runs in the browser
- Devices
- PC or laptop with keyboard and mouse
- Online play
- No — single-player
How to play Sonic Mania in your browser
- Press Play in browser — the game opens on gn-math.dev in a new tab.
- Wait while the game files load. The first start can take from a few seconds to a few minutes depending on your connection; later starts are faster because the browser caches the files.
- Click inside the game window so it captures the keyboard and mouse, then switch to fullscreen (F11 or the host's fullscreen button).
- Open the in-game settings to adjust controls, graphics and sound. Progress is normally kept in your browser storage, so don't clear site data if you want to keep your saves.
Sonic Mania controls
Default layout for this browser version. Keys can differ between builds, and most hosts let you rebind them in the settings. A USB or Bluetooth gamepad usually works too.
| Action | Key |
|---|---|
| Move | Arrow keys |
| Jump | Z / Space |
| Action | X / Shown in the game menu |
| Pause | Esc |
| Gamepad | Recommended — connect it before starting |
What to expect from the browser version
The browser version of Sonic Mania is an independent web project — a port, recompilation or fan remake — hosted on gn-math.dev. It is not an official release from Sega, and MePlayable does not host any game files: we describe the game and link to the project.
Because the game runs inside a browser tab, some features of the 2017 original may be missing or work differently: online modes, cutscenes, saves, mods and graphics options depend on the build. If something doesn't work, check the host's own notes.
Requirements
A modern desktop browser — Chrome, Edge, Firefox, Opera or Safari 16+ — with WebAssembly and WebGL enabled, at least 4 GB of RAM and a stable connection for the first load. Hardware acceleration should be switched on in the browser settings.
If Sonic Mania doesn't start
- Black screen or endless loading — update the browser, enable hardware acceleration and reload the page with Ctrl+F5.
- No sound — click inside the game window: browsers only allow audio after you interact with the page.
- Lag or low FPS — close other heavy tabs and programs, then lower the resolution or graphics settings in the game.
- The site doesn't open — the host may be temporarily down or blocked in your region. Try again later or use another project link on this page.
Screenshots (5)
Videos and trailers
Sonic Mania: frequently asked questions
Which site hosts the browser version of Sonic Mania?
The playable web version of Sonic Mania runs on gn-math.dev. MePlayable doesn't host game files: we check the link, explain controls and point you to the project page.
Can I play Sonic Mania online for free?
Yes. The browser version on gn-math.dev is free to open, and MePlayable doesn't charge anything — we simply link to the project.
Do I need to download Sonic Mania?
No. Sonic Mania runs directly in a browser tab using WebAssembly and WebGL, so there is no installer and nothing to download. The browser only caches files to make the next launch faster.
Can I play Sonic Mania on a phone?
The browser version is made for computers and expects a keyboard and mouse or a gamepad. Some phones and tablets can open it, but performance and touch controls are not guaranteed.
Can I play Sonic Mania with friends?
No. Sonic Mania is a single-player game, and the browser version focuses on the solo experience.
Is this the official Sonic Mania?
No. The original Sonic Mania was developed by Christian Whitehead, Headcannon, PagodaWest Games and released in 2017. The browser version is a third-party project, and all rights to the game belong to their owners.
Will my progress be saved?
Usually yes: saves are stored in your browser's local storage on this device. They are lost if you clear browser data, use private mode or switch to another browser or device.
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