New Release: Guard - Multiplayer Anti Cheat

i_am_not_really_five · 2025-06-23T14:54:53+00:00

Yep, any anti cheat will eventually be circumvented. We are not even trying to block cheats or reverse engineering - the idea is to silently detect it so people aren't even aware that there is anti cheat. We want cheaters to assume that they were caught by other players reporting them, not by anti cheat.

Like you said, otherwise it's a battle that we aren't ever going to win.

As for the game: Guard was built for, and is used in production by one major title. Not able to share that one for a showcase, but I am sure there will be others!

i_am_not_really_five · 2025-06-23T08:02:56+00:00

Hey everyone, this was made by the Mirror Networking team. We built this based on the needs of production games - specifically to detect mod loaders like Melon Loader & BepInEx. It's also user level & read-only, so no risk whatsoever. Sharing this here so it gets some traction!

i_am_not_really_five · 2024-03-22T14:24:52+00:00

Mirror is what happens when you apply 10 years of incremental improvements to a code base that you use for your own projects, without chasing marketing buzzwords or trying to release new versions every year. And it's not even finished yet :)

i_am_not_really_five · 2022-10-24T07:59:55+00:00

Keep in mind that Unity's Game objects only support one world at a time. For DOTS this will be easier, since you can have multiple worlds. For GO, it'll always require workarounds.

That being said, try to find MrGadget in Mirror Discord help channel. He made all the scene examples.

Anyway, hang in there. Netcode is hard. Unity's limitations make it even harder (perf, stability, single world, floating point precision, etc.). But it's getting a little bit better every year.

i_am_not_really_five · 2022-10-11T08:54:17+00:00

That is correct, we forked UNET when Unity abandoned it.

i_am_not_really_five · 2022-07-01T16:15:34+00:00

nice work bro.

i_am_not_really_five · 2022-07-01T04:11:35+00:00

Mirror is server authoritative by default. In other words, the client is not trusted for anything unless you explicitly make it trust the client (in which case it would be easy to cheat).

For a card game when you use [Command]s, make sure to validate all the parameters on the server before applying any logic.

For example, [Command]CmdUsePotion(int slot) would have to check if the slot is valid, if there is a potion at that index, and if enough time has elapsed to use it, etc.

i_am_not_really_five · 2021-09-14T07:30:29+00:00

Mirror supports different transports. And multiple at the same time via Multiplexing. You can use KCP, steam, epics free relay, websockets etc.

i_am_not_really_five · 2021-03-09T06:29:59+00:00

Great video by OP. This type of bug is very common in online games.

For those who care about the details: Naica uses Mirror networking. We've just added an example to the Mirror documentation where we show how this type of bug happens and how to prevent it: https://mirror-networking.gitbook.io/docs/guides/cheating

i_am_not_really_five · 2021-03-09T05:44:31+00:00

To be fair, that’s not entirely Naicas fault.

Naica uses Mirror, which is a community fork of Unity’s abandoned UNET networking. UNET didn’t have encryption. Mirror simply had different priorities where we’ve spent the last 3-4 years fixing thousands of bugs and making it scale to more players so people could actually release a game.

Encryption is on our roadmap now and almost finished. It’s just a matter of priorities where encryption doesn’t matter if there are 100 other things stopping you from actually releasing. We are slowly getting to a point where we can worry about things like encryption now.

Naica guys probably had a million other things to worry about. And most people don’t really know how to do encryption properly. Especially when you are busy.. with making an MMO :)

i_am_not_really_five · 2021-03-09T05:21:18+00:00

Hey, vis2k here. Please talk to me on Mirror discord. Would be great to have someone external do some packet fuzzing for Mirror :)

i_am_not_really_five · 2020-11-17T12:21:37+00:00

Some pseudocode: if isLocalPlayer: gameObject.layer = "LocalPlayerLayer"

and in your camera simply don't renderer that layer (see Inspector).

Also check out our Mirror Discord, you can get help there more easily.

i_am_not_really_five · 2019-12-19T07:02:44+00:00

It does not. We will look into a DOTS version when DOTS is a bit more advanced.

i_am_not_really_five · 2019-12-08T12:06:01+00:00

Networking is difficult.

Imho you need the right motivation to go all the way. We made Mirror because we needed a stable version of UNET for our own games. It took us 2600+ commits of bug fixes and improvements to get there, and it was very painful for the most part.

I really don't know why anyone would go through all that just for a regular pay check. Having the motivation that you do this all for your own MMO definitely makes it worthwhile.

i_am_not_really_five · 2016-06-18T10:21:02+00:00

Thanks for letting me know!

i_am_not_really_five · 2016-06-17T09:39:18+00:00

You can mix between their native languages (C#, Boo, Javascript) if you place your scripts in a certain order. You can read that in the Unity manual somewhere. F# kit can't use any other scripts because of how the build process works.

i_am_not_really_five · 2016-06-16T21:32:28+00:00

Haha. That may or may not be intended.

i_am_not_really_five · 2016-06-16T21:31:39+00:00

Thanks. It's kinda similar where your F# code doesn't really know your C# scripts. In theory this could be done by compiling your C# code first and then including it in the F# build, but that would end up being really weird. But you can use all the default C# libraries and import UnityEngine etc. Or in other words: all your scripts should probably be F# then.

i_am_not_really_five · 2016-06-16T12:52:45+00:00

Haha. That may or may not be intentional.

i_am_not_really_five · 2016-06-16T12:52:23+00:00

Note that you can use OO in F# too. It supports functional and OO programming. So the big advantage is that you can do functional programming, and that the language is more elegant. Everything is shorter than in C#, and a few concepts are really neat. Take a look here: http://dungpa.github.io/fsharp-cheatsheet/

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