Nubo plays your Game Boy and Game Boy Color games the way you remember them. It recreates the console one cycle at a time, so the picture, the sound and the tricks some games and demos play on the hardware come out just as they did on the real thing.
Point it at your games folder and your games appear in a library with their title screens, the ones you played last up front. Save anywhere with a save state, pick up right where you left off, play with a keyboard or a controller, and see Super Game Boy games in their own colors and borders, as they looked on a TV.
Made with AI
Nubo is made almost entirely by AI. Nearly all of its code and documentation, this README included, and even its name were written by Claude, Anthropic's AI model, working in Claude Code. I decide what Nubo should do and choose what goes in, but I write very little of it myself.
It started as an experiment: how good an emulator could I make using only AI, and how well would the quality of the code hold up? Nubo has very few original ideas. It rests on the clever ideas and hard work of many others, from the emulators it learned from to the people who wrote the test ROMs and documented the hardware, all named in the Credits.
If you'd rather not use software made this way, that's a fair choice, and it's why this is said up front.
Download
The download page offers the right file for your computer. Or pick one here:
- Windows: the files aren't signed yet, so SmartScreen may warn you the first time. Choose More info, then Run anyway.
- Linux: open the
.flatpak file with your software center, or run flatpak install --user Nubo-linux-x86_64.flatpak (Nubo-linux-aarch64.flatpak on ARM). Flatpak fetches the runtime Nubo needs from Flathub the first time.
- Browser: has what the desktop app has: the library, save states, cheats, screenshots (as downloads) and box art. Browsers have no game folders, so you add games (or open one) and Nubo keeps them in the browser, with their saves, until you remove them from the library. Clearing the site's data in your browser deletes them.
- New versions: the desktop app can tell you when a new version is out, and take you to the download for your computer. It asks first, since it looks on GitHub.
- Nightly build: the nightly build has the newest changes that passed every check.
Features
- Models: the original Game Boy, the Game Boy Pocket, the Super Game Boy 1 and 2, every revision of the Game Boy Color, and the Game Boy Advance playing Game Boy games. Nubo picks a model for each game, the Super Game Boy for games made for it. You can choose another in the settings, console first and then its revision, or for one game from its menu in the library.
- Super Game Boy: games made for it show their own colors and border, and games for several players can be played by up to four, each on their own controller. The pause menu lets you pick other colors, your own included, and another border. Nubo's own border, with its cloud peeking over the screen, shows a night sky or a day sky by your clock.
- Library: built from your game folders (in the browser, the games you add), with each game's title screen or box art, search, sorting by name or by when you played or added a game, and a Continue playing row with the games you played last. Each game has a menu (right click it) to pick the model it starts on, open its folder (in the browser, remove it) or delete its save states.
- Saves: save states with a picture, quick save and quick load, and continuing games where you left off. Loading a state, restarting a game or saving over a slot can be undone from the message that confirms it. In-game saves are plain
.sav files that move between the app and the RetroArch core.
- Controls: keyboard and controller, with buttons you can change and menus that work with a controller. Rewind (hold R) to go back a few seconds, fast forward, fullscreen and screenshots.
- Colors: gray, green or Pocket screens for Game Boy games, an original screen look, on by default, with Game Boy Color colors as soft as its own screen showed them and the original Game Boy's slow screen, which smooths out the flicker games use for see-through sprites, Super Game Boy palettes with an editor for your own, and light and dark themes that can follow your system.
- Cheats: GameShark and Game Genie codes, kept for each game. A cheat that needs several codes takes them all at once.
- Cartridges: the cartridge types almost all games use: cartridges without a mapper, MBC1, MBC2, MBC3 with its clock (as in Pokémon Gold, Silver and Crystal, including the larger MBC30 of the Japanese Crystal), MBC5 and HuC1. Games load from
.gb, .gbc and .zip files.
Getting Started
Nubo doesn't come with any games. Use games you own, or free homebrew games such as Tobu Tobu Girl Deluxe, µCity or the ones on Homebrew Hub.
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