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0.10.3 • Public • Published

A Game Boy emulator that is written in Rust 🦀.

This emulator has been written for educational purposes and shouldn't be taken too seriously. But yeahh it plays most Game Boy games, which is cool... 🕹️


  • Game Boy (DMG) and Game Boy Color (CGB) emulation
  • Simple navigable source-code
  • Web, SDL and Libretro front-ends
  • Audio, with a pretty accurate APU
  • Serial Data Transfer (Link Cable) support
  • Game Boy Printer emulation
  • Support for multiple MBCs: MBC1, MBC3, and MBC5
  • Save state support using the BESS Specification for cross-compatibility with other emulators
  • Cheat support using Game Genie and GameShark codes
  • Variable CPU clock speed
  • Accurate PPU - passes dmg-acid2 and cgb-acid2 tests

For the Web front-end...

  • Mobile first experience
  • Transparent RAM saving using Web Storage API
  • GamePad support using Web Gamepad API
  • Unobstructive and effective on-screen GamePad
  • Rumble emulation and haptic feedback
  • Cool bespoke display palettes built by TheWolfBunny64.
  • Fullscreen browser mode
  • Debug mode - VRAM and registers

What's still missing...

  • Low-level cycle accurate system emulation
  • Game Boy Camera emulation
  • NetPlay gaming support


Provider Stable URL
Cloudflare True
Cloudflare True
Cloudflare True
Cloudflare True
Cloudflare False



cargo build

Python Library

pip install .


python install

WASM for Node.js

cargo install wasm-pack
wasm-pack build --release --target=nodejs -- --features wasm

WASM for Web

cargo install wasm-pack
wasm-pack build --release --target=web --out-dir=frontends/web/lib -- --features wasm
cd frontends/web
npm install && npm run build
cd dist && python3 -m http.server

Web front-end

The Web front-end makes use of EmuKit which is a UI toolkit that provides the required infrastructure for the creation of interfaces for emulation in a Web context.


You can use some GET parameters to control the initial behavior of the emulator.

Parameter Type Description
rom_url String The URL from which the initial ROM is going to be loaded, should support CORS.
url String The same as rom_url.
fullscreen Boolean If the emulator should start in fullscreen mode.
fs Boolean The same as fullscreen.
debug Boolean If the "debugger" should start visible and information shown in verbose mode.
verbose Boolean If information should be shown in verbose mode.
keyboard Boolean If the on-screen keyboard should start visible.
palette String The name of the palette to be set at startup( eg: christmas, hogwards, mariobros, etc.).


The palettes offered in the web version were provided by TheWolfBunny64.


To get some information about the resources that inspired me through the emulation creation journey check Inspiration.


Love Gameboy emulation? Want to contribute to Boytacean? That's awesome! Your contributions are what make the open-source community such an amazing place to learn, inspire, and create.

To get started, please take a look at our Contributing Guidelines. Whether you're fixing bugs, adding new features, or helping with documentation, every contribution is valuable and greatly appreciated!

Don't hesitate to reach out if you have any questions. Join us in making Boytacean the best Gameboy emulator out there!


Boytacean is currently licensed under the Apache License, Version 2.0.

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  • joamag