Adding Metamask to your Unity WebGl Blockchain Game

Metamask is one of the most popular wallets that is used to interact with the Ethereum Blockchain. And so from a practical standpoint, it makes sense to leverage Metamask as our wallet of choice to send and sign transactions for games built using Unity. In this tutorial, we will take a look at how to integrate Metamask with a Unity WebGL application in order to send messages from C# to Javascript so that we can interact with Javascript and Metamask or in other words window.ethereum.
Discord : / discord
Relevant Links :
1. WebXR Metamask Github Repo : github.com/FusedVR/WebXR-ETH
2. NEthereum : github.com/Nethereum/Nethereum
3. Unity Sample : github.com/Nethereum/Unity3dS...
4. MetaMask : metamask.io/
Chapters:
0:00 Metamask Demo
1:49 Github Open Source
3:06 Unity Project Structure
3:42 Smart Contract
4:24 WebGL Build Settings
5:05 WebGL Index Page
6:05 Metamask Javascript
7:32 Metamask Functions
10;37 Next Steps
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[@SarkisianNile]

Thank you so much for these

[@FusedVR]

More to come :-)

[@SarkisianNile]

@@FusedVR I'm trying to load WebGL player for Unity 2020+ with Web3, but it seems its changed for streamlined loading. Let me know if you have any tips.

[@FusedVR]

@@SarkisianNile so my understanding is all the web3 APIs are deprecated and have basically been replaced with etheruem apis like this docs.metamask.io/guide/ethereum-provider.html#table-of-contents

[@SarkisianNile]

@@FusedVR TY Fuseman, lemme c if I can't whoop something up. Will post my results.

[@SarkisianNile]

Got it to go in 2020+ by changing the .Net settings in Unity. Now I'm looking into connecting to Metamask in game - which seems maybe Metamask's preferred way (?)

[@danielesuppo8083]

Hello! Great tutorial! What if I publish my game, and someone does not use Metamask but some other wallet? Should I implement the API for all the possible wallets in the js file, and ask at start which wallet they want to use??

[@danielesuppo8083]

Many thanks! How can I modify to Mint function (on Remix) to accept a receiver address parameter? Actually it just send tokens to me (msg.sender)

[@isaquecrazy]

Flapyp have error: Assets\Scripts\ScoreContractService.cs(99,6): error CS0246: The type or namespace name 'Parameter' could not be found (are you missing a using directive or an assembly reference?)

[@tyebeach]

Thank you for these videos! I want to create a game and make sure that the player has my token in their wallet. I have metamask working I just don't know how to check to see if there is a certain amount of my token in their wallet. Could you possibly help me with this?

[@FusedVR]

i would take a look at something like this ; docs.metamask.io/guide/rpc-api.html#other-rpc-methods im still doing more research myself into smart contract integration and best practices, but hopefully that is a start

[@tyebeach]

@@FusedVR Awesome, thank you!

[@kenmarold6029]

Can this work on Metamask using the Polygon blockchain instead of Ethereum?

[@FusedVR]

I believe so just requires switching to the Polygon network in Metamask

[@androck9794]

where i can learn to do this by myself? any course?, i want to know how to connect metamask with unity to make NFTs..

[@FusedVR]

im really only aware of a few blog posts I have seen while Googling and my videos. if you have any specific questions, feel free to ask over on our discord

[@Rabbit14]

How would I go about adding metamask in unity that would just confirm you hold a certain erc20 and then allows you into the game?!

[@FusedVR]

check out Chain Auth, which allows for this

[@Rabbit14]

@@FusedVR thanks, does it also work for unreal?

[@FusedVR]

@@Rabbit14 no sdk at the moment, but all the apis can be called from Unreal yes

[@damsan7777]

I wana see when the players open the box. And then are 3 diferent NFTs there. Is this posible?

[@FusedVR]

recently put up some NFT videos on a similar topic

[@jhhuh3374]

this is for WebGl, but what about other platform? do one need a built-in wallet in the application to connect to a blockchain?

[@FusedVR]

take a look at our previous video : kzbin.info/www/bejne/hnvaemabo52kbZo you can implement it for other platforms provided you have a means to get a private key

[@jhhuh3374]

@@FusedVR i dont think ppl would be too much happy about giving away their private keys though, i can only think about: making address for any player on server side and give access from client to the address

[@jhhuh3374]

@@FusedVR never-mind actually just making a sort of in-built wallet on client side could be ok, do you know any discord for unity+blockchain development?

[@awuchen2718]

@@FusedVR is there anyway to have metamask integration in iOS? or can this only be done through webGL?

[@Blutch4444]

How would someone go about making a unity game on polygon? Since ETH gas is too high

[@FusedVR]

exact same way except you would deploy contracts to polygon

[@Niknikolaou00]

As i undestand i have to use private keys inside unity? Or not need?

[@FusedVR]

with metamask, no need. Metamask will be responsible for signing with the private key

[@Niknikolaou00]

@@FusedVR Thanks Bro Great videos. I will check your Github Repo

[@mrprogress7236]

Hi! Thanks for the video! Is it possible to connect windows build with metamask?

[@FusedVR]

i guess technically it may be possible, but that would basically mean having windows up a browser to run metamask for you as i dont think there is a windows build of metamask

[@mrprogress7236]

@@FusedVR true, we are already working on it, i will update you ones ready :))

[@mrprogress7236]

@@FusedVR the most tricky stuff is a build ux friendly bridge between site and windows build

[@subhradeepc9513]

@@mrprogress7236 Did you happen to achieve any success with the Desktop wallet scenario ?

[@ZX6R_SQUID]

These videos are great. Are you able to make a video on a NFT contract that triggers using collider? So say you pickup an item it will mint a NFT of said item? That would be great. I have been trying for months and just can't get it.

[@FusedVR]

starting this weekend, will be doing ERC 20 and then shortly after plan to look at NFTs

[@ZX6R_SQUID]

@@FusedVR Awesome collecting ERC20 using colliders? that would be amazing.

[@ZX6R_SQUID]

@@FusedVR Also your tutorials are dope bro.

[@FusedVR]

@@ZX6R_SQUID just ERC 20, but could of course run the same code on a collider event

[@diosito_dev]

this work with binance smart chain ?

[@FusedVR]

yup

[@vfxninja1156]

I'm looking to create a game in Unity, where players can collect crytocurrency tokens and NFT tokens. Is this possible as I can not find any tutorials or resource's online? Great vid by the way FusedVR

[@FusedVR]

definitely possible and is on my list of things to check out, just might be sometime till i get around to it

[@The-Sentinel]

great video. what about allowing access to a specific part of a game if the user holds an NFT or certain erc type token? like, sign your wallet to verify and get teleported to a members area of a game.

[@FusedVR]

pretty close to something similar i plan to make a video on in the future - enabling access to a game only if you own the NFT.

[@hvillacruz]

can use this for BSC?

[@FusedVR]

have not tested this, but from my understanding BSC is compatible with Metamask so should be possible

[@priyanshusahu8024]

Is there anything like this in unreal Engine ?

[@FusedVR]

as far as webxr exporters go, not sure

[@cryptoworldgames]

can you help me use metamask (binance smart chain network) on a browser unity game, or a pc unity game please?!!! i'll pay you to help

[@FusedVR]

feel free to reach out on discord and we can chat

[@bizkit.]

is there a way to connect to another custom EVM?

[@FusedVR]

same tutorial works if you add binance or polygon to metamask

[@bizkit.]

@@FusedVR you're the best, thanks!

[@shinronitgaming486]

Is it possible to do this with windows build?

[@FusedVR]

not sure there is an easy way to do this and I think would require a server in the middle to handle the auth.

[@shinronitgaming486]

@@FusedVR we have a server can you make a video on it?

[@shinronitgaming486]

@@FusedVR also can you upload a video of phantom and unity wallet integration? That would be really helpful.

[@FusedVR]

@@shinronitgaming486 will need to think about the best way to handle that but yeah I;ll keep it in mind

[@sarahwonkim6046]

how do u add json files

[@FusedVR]

in what regard?

[@sarahhhkimmm]

@@FusedVR I was having trouble adding json files to unity because it will only do c#

[@FusedVR]

@@sarahhhkimmm I recommend this package : com.unity.nuget.newtonsoft-json Works a lot better than the default JSON in C#

[@dreamscheme3862]

too bad webgpu is years away and webxr isn't enough. No compute shaders, poor performance. It's a shame...

[@FusedVR]

true. to be honest, I am more interested in web from a streaming standpoint for cloud gaming or cloudxr