MUN · Development journal

MUN, on Discord too

2026-10-11T00:00:00Z

We opened a Discord server for MUN™: discord.gg/UxgExjjhxH.

It is there to follow the build more closely: to talk about MUN OS, the hardware, Game Cards and games, to ask, to suggest, or just to come say hi. English and Spanish welcome.

If you make games and the Game Card or MUN Shape interests you, it is also a good place to start a conversation.

This journal stays where we tell each step calmly; Discord is where we talk it over.

MUN OS, in Spanish too

2026-10-06T00:00:00Z

Since the 0.1.0-dev.3 preview, MUN™ OS's documentation is in Spanish too:

the README, getting started and the glossary;
compatibility, contributing and security;
the guides to create a Game Card and to bring a game to MUN, and the two MUN Shape guides;
the examples, with the MUN Shape sample packages.

Every page links to its English original, and the original to it. English stays the technical reference: the contracts and each component's README are in English.

A translation that falls behind goes unnoticed until it confuses someone. So each one is recorded with the exact version of the original it was reviewed against, and the project's check fails if the original changes afterwards: an outdated translation is not published.

The console itself already spoke Spanish: it is chosen in the settings.

MUN Shape: the game beyond the game

2026-10-06T00:00:00Z

The 0.1.0-dev.3 preview of MUN™ OS brings the first version of MUN Shape: while its card is in, a game can dress the console in its own identity.

What a game can bring

A palette and materials (solid, glass, paper) for the menu and the game's panel.
The card object, with its art.
A world behind the menus, with layers, particles and lights.
Transitions that bring that identity in and take it away.
Its sounds on the menus and a cue when the card goes in.

Data, not code. The card carries a folder, content/mun-shape/, and the console draws it with its own code: nothing on the card runs. A card without a package takes the colours of its cover.

What stays MUN's: the layout, the navigation and the system's words, the settings and the dialogs, and legibility: text and focus keep their contrast over any world, on every frame. And the player decides in the settings: MUN Shape in full, colours only or off, less motion, and the game's sounds on the menus.

For studios: tools to make and check a package, put it on a card and watch it change live in a virtual console; two samples, sea and paper; and two guides: dress the console in your game and see MUN Shape in action.

It is the tool a studio can use to show the art that does not fit in the box. And this is only v1: much more is coming.

This preview passed the automated checks in GitHub's virtual machines on five systems (macOS, and Linux and Windows on x86_64 and ARM64), without a window; with a window and sound, only on a Mac so far. To try it, the getting started guide.

MUN OS, in the open

2026-09-30T00:00:00Z

The code of MUN™ OS, the console's system, is on GitHub now, under the Apache License 2.0: github.com/Play-MUN/mun-os.

There is no hardware yet. What there is is a preview, 0.1.0-dev.2: an ARM64 image your computer runs as a virtual console with QEMU, the same on macOS, Linux and Windows.

What you can do with it

Switch the console on, insert the MUN Collect Game Card, play and save on the card.
Switch it off, on again, and carry on where you left: the save lives on the card, not in the console.
Eject the card safely, and choose the language and the resolution.

Where it has been checked

On a Mac with Apple Silicon, with window and sound.
On GitHub's virtual machines, without a window: macOS, Linux (x86_64 and ARM64) and Windows (x86_64 and ARM64). We have not tried it yet on a Linux or Windows PC, nor with window and sound outside the Mac.

What is new

A start-up of its own: Play MUN, then MUN with its moon, in time with its sound.
The menus' sounds, and games built on SDL or OpenGL in the console's resolution.
Guides to get started, make a Game Card and bring a game to MUN.

Not there yet: controllers (keyboard for now), updates and the hardware.

Every image comes with the source of the packages it is made of. To try it, getting started; to contribute, contributing.

Built in the open

2026-09-28T00:00:00Z

MUN™ is a console built around the game: a Game Card is enough to own and play a game, with no account and no connection.

This journal tells how it is built. Every entry says what works, where it works and what is missing:

What works today, and under which conditions: for now, on a virtual console.
What breaks, when it breaks, and how it gets fixed.
What we decide, and what we set aside.

The first stage is under way: MUN OS reads a Game Card, validates it, launches the game and saves progress on the card itself. Next comes real hardware.