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This repo is no longer maintained

This repo was maintained by Raystorms, but due to personal situations they are not longer able to maintain the repo.

The Mirror community has stepped in and now Chykary is the maintainer of FizzySteamyMirror.

Download the latest version of FizzySteamyMirror please goto: FizzySteamyMirror.


This is a community maintained repo forked from FizzCube. Mirror docs.

FizzySteamyMirror brings together Steam and Mirror utilising Async of a Steam P2P network transport layer for Mirror.


If you want an easy import, skip the steps bellow & download the unitypackage, it has Steamworks.Net already included.

Note: If you already have Steamworks.Net in your project, you might need to delete either your import or the one included in the release.

Both of these projects need to be installed and working before you can use this transport.

  1. Steamworks.NET FizzySteamyMirror relies on Steamworks.NET to communicate with the Steamworks API. Requires .Net 4.x
  2. Mirror FizzySteamyMirror is also obviously dependant on Mirror which is a streamline, bug fixed, maintained version of UNET for Unity. Recommended Stable Version

Setting Up

  1. install the dependencies Download the unitypackage
  2. Create a empty object in your scene and attach the "Steam Manager" script to it.
  3. In your "NetworkManager" object replace "Telepathy" script with "FizzySteamyMirror" script.


  1. When Building your game you have to place "steam_appid.txt" into the directory of the game. If you cant find it well, just make a "steam_appid.txt" and place 480 in side.

  2. When running the game make sure you have placed it into steam as a Non-Steam Game Note: This is not required, but some have reported their steam SDK not working without doing this.

Note: The 480(Spacewar) appid is a very grey area, technically, it's not allowed but they don't really do anything about it. When you have your own appid from steam then replace the 480 with your own game appid. If you know a better way around this please make a Issue ticket.


To be able to have your game working you need to make sure you have steam running in the background. Note: You can also run it in Unity

  1. Host your game
  2. if it says your playing "Spacewar" in Steam congrats its working!


Before sending your game to your buddy make sure you have your steamID64 ready. To find your steamID64 goto and enter your steam profile URL.

  1. Send the game to your buddy.
  2. Your buddy needs your steamID64 to be able to connect.
  3. Place the steamID64 into "localhost" then click "Lan Client"
  4. Then they will be connected to you.

Testing your game locally

You cant connect to yourself locally while using FizzySteamyMirror since it's using steams P2P. If you want to test your game locally you'll have to use "Telepathy Transport" instead of "Fizzy Steamy Mirror".


An Async implementation of transport for Mirror




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