Free QuestIntermediate

Free • No account needed

Two Windows Talking

Quest 1 of 8 on the Godot 4 Multiplayer path → a finished game

Connect a desktop Godot host and clients, publish a complete player roster, and build an inspector, an application-message fault dial and a bot connection.

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Lessons

740

XP Reward

Intermediate

Difficulty

No videos to zone out to. You write the code yourself in the browser, and Code Checks show what your code passed as you go.

The Postcard Problem

Late, Out of Order, or Never

Your First Server

Two Windows

Who Just Joined

The Network Inspector

Messages, Payloads, and Ping

2-3 hours 9 lessons Godot 4.x

Two Windows Talking project preview — Project preview: Two Windows Talking

Two ways into the Co-op Multiplayer

Both lead to the same design lessons. Picking one never marks a lesson as done.

Build the multiplayer game from scratch

Free to start. Membership after the free lessons.

Start lesson 1 free

Start with a working co-op shooter

A Godot 4.7 download, free with a free account. Design lesson 1 is free, the rest need membership. The browser demo on this page is solo. The download is the two-player desktop game, and two windows on one computer are enough to start.

Get the playable copy

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Free quest. No membership needed.

Your Progress

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0 of 9 lessons completed

Free download. Needs a free account, no card.

It is the finished project for the whole quest. Use it to compare your work or to recover a broken step.

Quest Details

Est. time: 2-3 hours
Lessons: 9
XP reward: 740 XP
Difficulty: Intermediate
Access: Free

Want the finished system?

This quest builds one part of it. Online co-op with a ready-up lobby, chat and server-checked movement that still feels instant. Free to download, MIT licensed, no account needed.

View the free open-source version on GitHub What is in the Multiplayer Starter project

Skills You'll Walk Away With

Desktop ENet multiplayer

Quest Lessons

9 lessons

The Postcard Problem

25-60 min

Signal Lost is a desktop ENet co-op shooter for two to four players. Begin with browser experiments; Godot starts in lesson 3.

Late, Out of Order, or Never

25-60 min

Arrival order and send order can differ. Some messages never arrive.

Your First Server

25-60 min

Create an empty project with Godot 4.7.2 and the Compatibility renderer. The supplied files completely define its first runnable state.

Two Windows

25-60 min

create_client starts a connection attempt. Only connected_to_server establishes a usable client connection.

Who Just Joined

25-60 min

The server owns the roster. Each client registers its name after connecting, then receives the whole authoritative roster.

The Network Inspector

25-60 min

DebugOverlay keeps a CanvasLayer root. Its Panel/Rows/Header path is explicit in the supplied scene.

Messages, Payloads, and Ping

25-60 min

Application message counts are different from network packet counts. ENet headers, retransmissions, spawns and property synchronization are not measured here.

The Application-Message Dial

25-60 min

The dial delays or drops an application call before it reaches ENet. A dropped reliable call was never submitted for retransmission.

The Bot Client

25-60 min

A bot is another client process using the same connection path. At this stage it logs its ID; no player scene exists yet.

Is This Quest For You?

Perfect for you if:

You know basic GDScript and want to build one multiplayer project step by step.

Not for you if:

You need a production matchmaking service or browser multiplayer transport.

Common Questions

Your Next Build Starts Here

Continue building Signal Lost

Connect a desktop Godot host and clients, publish a complete player roster, and build an inspector, an application-message fault dial and a bot connection.

Start Lesson 1 Free

After this quest

Finish it, then keep the momentum. Here's the logical next step.

Recommended

RPCs: Who Is Allowed To Say What

Quest 2 of 8 in the Co-op Multiplayer campaign.

Send correctly permitted RPCs, synchronize names, add chat and ping, and compare application-message loss with real ENet datagram loss using the included Python relay.

Free4-6 hours

State Machine AI for 3D Enemies

Optional. Not part of your current route. Needs: Code From Zero, or you can already read GDScript.

Build a full state machine AI for 3D enemies in Godot 4.x. They chase, attack, circle, back away, and react to damage with real knockback and combo tracking, the kind of enemy that actually feels alive.

First 4 lessons free10-14 hours

Advanced Inventory UI

Optional. Not part of your current route. Needs: Finish Inventory System first; Finish Stats & Leveling System first.

Turn your inventory backend into a real, playable UI: drag-and-drop, tooltips, an equipment doll, a hotbar, and save/load.

Guild Hall7-9 hours

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Build real Godot systems, one lesson at a time