Unity multiplayer

Unity multiplayer, hosted

Install the package from the Package Manager by Git URL. Add com.unity.webrtc to connect players directly; without it, everything routes through the server relay and still works — useful on platforms where WebRTC is not available. Unity 2021.3 and newer are supported.

Because the API is not tied to Unity, a single game key serves every build you publish. A mobile player and a browser player can quickmatch into the same room.

A complete Unity integration

using MultiplayerApi;
using Newtonsoft.Json.Linq;
using UnityEngine;

public class Net : MonoBehaviour {
    Multiplayer mp;
    Room room;

    async void Start() {
        mp = new Multiplayer("mp_pk_...") { DisplayName = "Alice" };
        await mp.Login();
        room = await mp.Quickmatch(new JObject { ["mode"] = "ffa", ["max_players"] = 8 });

        room.OnMembersChanged += members => Spawner.Sync(members);
        room.OnPeerMessage    += (bytes, from) => Ghosts.Apply(from, bytes);
    }

    void Update() {
        if (room == null) return;
        var p = transform.position;
        room.Send(new { x = p.x, y = p.y, z = p.z });
    }
}

What goes where

• Throttle Send to 15–20 times per second in production; interpolate the rest.
• Password recovery is built in: your server requests a token with the secret key, the client calls await mp.ResetPassword(token, password).
• Non-browser clients send no Origin header, so the origins allow-list never blocks a Unity build.

Keep reading