Librebox: An open source, Roblox-compatible game engine

168 libreboxdevs 46 8/23/2025, 11:22:15 AM github.com ↗

Comments (46)

lihaciudaniel · 1m ago
As an avid Roblox player. I am 21 btw (jk I was 9 when playing) I could run this on a VM on my phone and show off to kids
koshergweilo · 3h ago
> Librebox is currently in demo stage (it implements a limited subset of the Roblox API

Probably worth mentioning this is just a demo. There's a looooong list of API features that aren't implemented (most notably servers and networking)

paweladamczuk · 34m ago
>missing :WaitForChild()

That's good... isn't it?

DistractionRect · 20m ago
It's not the end of the world, it's a minor convenience and better than busy waiting.

There are plenty of cases where you want to manipulate an object but it's not guaranteed that it exists before your code is run. You get similar functionality with:

while not parentObj:FindFirstChild("childObj name") do wait() end

AFAIK, wait() is >= 1/30 of a second, if you wanted to be extra timely you'd instead run every heartbeat.

forkerenok · 10m ago
"Popular kids game Roblox faces pressure over allegations of child predators on its platform":

https://www.google.com/amp/s/www.msnbc.com/msnbc/amp/shows/t...

I read your comment carefully to see whether you've taken the GP's joke further, but alas :)

poly2it · 6h ago
Best wishes, this is really neat. I hope it won't get slaughtered by Roblox's legal team. A potential use-case might be to create a Linux-native client. The one used by most right now (Sober) is proprietary, after the previous (Vinegar) got shut down because of Linux haxxors.
Wowfunhappy · 5h ago
> I hope it won't get slaughtered by Roblox's legal team.

I'm not saying Roblox won't try, but this project strikes me as very obviously legal.

If legality was a spectrum, I'd rank this higher than VLC Media Player (patents) and way above an NES emulator. I suppose it'd be below Android, and Oracle did sue over Android.

(Disclaimer, I am not a lawyer, etc.)

999900000999 · 5h ago
Two factors are at play.

This looks like it just reimplements a few Roblox APIs in an open source engine. It would of probably made more sense to just create a Roblox to Godot translator or something.

Second, your poking a multi billion dollar bear. If this project ever takes off Roblox will take action, right or wrong that's enough to stop most small projects. You can be right, but you don't have millions to fight non stop lawsuits.

In reality this is a cute proof of concept. It's never going to compete with the actual product. If it does Roblox will have it stopped in 72 hours

giancarlostoro · 4m ago
> It would of probably made more sense to just create a Roblox to Godot translator

Its meant to be running live so you can play the many dynamic roblox games, I guess you could but it would be a mess.

axus · 3h ago
The open source part is key. Plenty of online Pokemon and World of Warcraft clones out there, they can't seem to catch them all.
lukan · 3h ago
No need to. But anything too succesful should be ready to be brought down any moment.
gjsman-1000 · 5h ago
In practice, no society has ever overcome “might makes right.” Or, arguably, ever will.

The good news though; it’s lawyers shutting down your project. Yesterday, it was hiring someone to break your knees.

RealStickman_ · 23m ago
VLC is French, so the US law on software patents doesn't apply to it.
LocalH · 1h ago
Emulators are unambiguously legal as long as the emulator author doesn't distribute copyrighted software without permission, and as long as no encryption is involved (recent action by Nintendo have made that bit a little unclear).
pbhjpbhj · 1h ago
In all jurisdictions? What are the principal pieces of caselaw?
hnlmorg · 30m ago
I don’t know of any country where emulation is illegal? Do you?

As the GP pointed out, OEMs use copyright and encryption to protect against unapproved execution. But that doesn’t apply to all systems.

Given countries like the UK and US have the strictest intellectual property and computer misuse laws, and emulation is legal there (bar the aforementioned caveats), I’d be surprised if there was a jurisdiction where emulation was illegal. However if you do know of somewhere then please do share.

jayd16 · 2h ago
You don't need to be doing something wrong to get crushed by legal fees.
kartoffelsaft · 5h ago
Curious what makes you say it'd be less legally dubious than an emulator? To me, it seems this would be at the same legality as the NES emulator because you're basically 'emulating' the environment Roblox game code runs in. To be fair if that intuition's correct it'd still be legal like emulators are if they're careful.

(also not a lawyer)

conradev · 4h ago

  So long as the specific code used to implement a method is different, anyone is free under the Copyright Act to write his or her own code to carry out exactly the same function or specification of any methods used in the Java API. It does not matter that the declaration or method header lines are identical.
Emulators often require handling copyrighted materials like games or firmware, whereas APIs are not copyrightable.

https://en.m.wikipedia.org/wiki/Google_LLC_v._Oracle_America...

LocalH · 1h ago
The NES itself contains no code. Any NES emulator that ships with no software, or software under proper license (such as homebrew) is unambiguously legal. Does your PC, and the OS that drives it, suddenly become inherently illegal if you, as a user, installed pirated software? No, of course not.
pbhjpbhj · 1h ago
No firmware, no microcode? It's all completely hard-wired?

(Genuine question, I've no idea what chips it uses or anything - was never rich enough to have a game console until I started work myself.)

shortrounddev2 · 1h ago
The supreme court ruled against oracle that an API cannot be copyrighted, but Roblox can still ban you for using an unofficial client (like discord does)
bitwize · 2h ago
I have a feeling projects like this rank higher on Roblox legal's priorities than does the rampant child predator activity on Roblox's platform.
echelon · 2h ago
100%. Roblox will snuff this out immediately.

You need to make custom servers. In fact, make a server that patched official clients can connect to. That's the correct order of operations.

bstsb · 2h ago
can't find anything about the developers from the github repo.

their discord server is even stranger; there's absolutely nothing in the channels, and the only member with a developer role is an account dedicated to the "project".

looking at the source, work has absolutely been done - this isn't just a README - but it's still all a bit strange

JoeOfTexas · 28m ago
One man shows be like that =(
extraduder_ire · 6h ago
Cool. There's an incredible amount of content created for roblox that's stuck on it currently.
wernerb · 6h ago
Need to set free all that 'Club' content for sure.
glitchc · 6h ago
Yeah but can I spend Robux on it? If not, pass.

The whole problem is Robux isn't it? It's not like the engine is anything special.

a2128 · 5h ago
There's a number of developers who get stuck on ROBLOX because they learned their creation tools when they were younger (they're easy to use and easily accessible to any desktop ROBLOX player), spent their formative years mastering their skills, and those skills turn out to be niche and not easily transferable to most other game engines. The choice is between basically restarting as a beginner in Unity, or continue making advanced creations on ROBLOX with all their friends and prestige they've earned in various sub-communities. To be honest I'm surprised it took this long for someone to try making an API-compatible alternative
andybak · 6h ago
Maybe the idea is that developers can release standalone versions of their Roblox games and escape the platform lock-in? Of course - whether their audience will come with them is a different question.
Wowfunhappy · 6h ago
I haven't used them (and I despise Roblox) but my understanding is that the Roblox creation tools are actually pretty good.
westurner · 3h ago
Does this increase local testability and thus QA-ability for roblox devs?

I was just looking at trying to get Lemur (archived) running in Lune in order to run jest tests running in a react-lua app the other day. I have a start at a test runner with optional in-game output, but getting jest tests to run at init in studio in order to not require run-in-roblox which doesn't yet work on Linux with vinegar flatpaks studio or vinegar in a devcontainer. It would save so much trouble if RobloxStudio.exe could take `--place game.rbxlx --script test_runner.lua --keep-open` args and regularly flush console output to a file.

westurner:lemur:patch_for_roblox_support: https://github.com/LPGhatguy/lemur/compare/master...westurne... .. new require() implementation in lune v0.10: https://github.com/lune-org/lune/issues/311#issuecomment-320...

I started to add loadPlaceFile to read an rbxlx to lemur and thought it probably the wrong place given that it's archived. TIL about Librebox, which can hopefully run tests with Jest with this stemgame react-lua app I've MIT licensed, in local CI too years later.

There is a hosted CI service for running Luau code in Roblox places.

"[Beta] Open Cloud Engine API for Executing Luau" https://devforum.roblox.com/t/beta-open-cloud-engine-api-for...

Advantages to running tests locally: record screenshots and screencasts and save on test failure, immediate feedback, -i/--interactive drop into game session on test failure

doctorpangloss · 3h ago
There are a lot of free remakes of commercial games, and a lot of free remakes of commercial game platform engines. How do the developers of Librebox decide to work on this instead of:

- remaking one specific, good game on Roblox, such as remaking Bloxburg, in something more practical like Unity?

- working on an existing free remake of a Roblox game, like Nexus Battles, which of course, was archived?

- working on something else?

I’m asking the “Libreboxdevs.” It’s nice to hear these POVs directly from the developers. As you guys read this on a Saturday morning, consider that I’m not asking for, what features are going to be added to your GitHub project, or a comparison between Librebox and other game engines or whatever. I’m asking about your personal decision making.

ktallett · 6h ago
This is fantastic! It is a very useful tool for preservation of games on Roblox. I hope this can be used for good to save the many creative and original works on the platform in a way that we didn't with flash games.
unleaded · 4h ago
Roblox preservation has pretty much been a solved problem since around 2016. The clients all have built-in network servers and many people have built launchers to let you easily play a server with your friends. A lot of the knowledge is unfortunately gatekeeped inside Discord communities of crazy people but there are a few "good names" out there (Novetus is the big one)
jhatemyjob · 3h ago
Thanks for that info.

To be honest this librebox project looks kinda fishy to me. Seems like the author never used version control before. They put everything into one commit [1] and are making changes to the repo using the Github web UI. I wish the dev the best of luck but I wouldn't be surprised if this project gets abandoned in a few months

[1] https://github.com/librebox-devs/librebox-demo/commit/e70ea3...

Dilettante_ · 5h ago
>in a way that we didn't with flash games

I thought Flashpoint[1] did pretty well about that? The full download is 1.68TB, I'd wager most stuff you'd have seen back then would be on there.

[1]https://flashpointarchive.org/

533474 · 3h ago
You should rename the project to OpenBox if you are not using a copyleft license. It is not libre.
LtdJorge · 3h ago
Libre means free. MIT gives more freedom than copyleft.
ekzy · 20m ago
French native here. Libre means free in the sense of freedom, not in the sense of free as in free beer (the term for that is “gratuit”)
tombert · 1h ago
I think they're saying that "Libre" typically implies Copyleft, with a GPL or AGPL or MPL License. Something that (in some cases) forces you to make your changes available.

LibreOffice, for example, is Mozilla Public Licensed, which is a weak copyleft, like LGPL (I think).

danieldk · 1h ago
It's just silly gatekeeping. E.g. LibreSSL is permissively-licensed and is from 2014.
tombert · 57m ago
Yeah fair enough. Pedantry about names can get silly.
daft_pink · 2h ago
The Roblox debacle really reminds me of the 90’s where almost every arrested child predator was using AOL, but the news media would use the word “online service” or some really generic term as AOL spent so much money on advertising.

A 5 year old isn’t going to be using IRC after all.

sejje · 1h ago
This is about an open source coding project