ProjectLighthouse VS Impostor

You probably just Googled that without typing "lbp" after it. Here you go https://github.com/LBPUnion/ProjectLighthouse

Not with online sadly. RPCS3 does not have fully implemented raw socket functionality to allow LBP1-3s P2P multiplayer to work. You can still privately host https://github.com/LBPUnion/ProjectLighthouse to restore much of the online functionality such as profiles and uploading levels. However, if you patch your copy of the game on a modded PS3 to look for your server instead of the official ones it should be able to matchmake for multiplayer.

If you really wanna, you can check the project here.

Yes you can: https://github.com/LBPUnion/ProjectLighthouse

Oh I have news for you! (Still a work in progress but it looks like its making good progress!)

A private server (Impostor) can't be achieved due support starting from version 2020.09.27.

Here it is

There are a lot of big issues with the game that have been there since it got it's spike in popularity, mainly no accounts/accountability for shitty behavior in-game, hackers, and not enough content/maps. These things seem like they would be easy to implement; I have literally seen a team of 4 students rebuild the game from the ground-up so they could add and make custom maps, it only took them a month. Modders have created custom servers by reverse engineering the game that have better anti cheat than the official servers. Modders have also been successful in making and adding more cosmetics quickly. These people literally do it for free while the team that's making all of the money from this game can't seem to do it in a timely fashion.

If you want host your own server you can use Impostor (https://github.com/impostor/impostor). If you don't want to deal with setting up an Among Us server yourself you could always use ServerFlex's Among Us Server Hosting which is free.

I recommend to start with little server side plugin with impostor like random map or mix up all players skin, colors pet and name.

It would be difficult to add it to the original game, and it would take many hours of work to just replace an existing map (Doing so might not even be possible). However, I'm actually working on a recreation of Among Us, aiming to make my custom client compatible with Innersloth's client. (I have only tested it on Windows and Android and my current version just crashes on Android.) I could try adding this map into my custom client, but then I'd also have to fork the Impostor project and make the server support the custom map as well.

You should use Impostor instead. You can run your custom Among Us server with this.

If you want to learn more about how game codes are encoded and decoded, check this Github page: https://github.com/Impostor/Impostor/blob/dev/src/Impostor.Api/Innersloth/GameCodeParser.cs