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CogtopiaDWG N° CGT-01 · 1.21.1

PL.01 Install guide NeoForge 1.21.1

How to join
Cogtopia

A modded Minecraft server built around Create — gear-driven factories, trains, steam-powered contraptions. To get in, you need the modpack: follow one of the two methods below, it only takes a few minutes.

// SERVER Address to add in Minecraft
play.cogtopia.games

Java 21 is downloaded automatically by both launchers — you don't have to install anything yourself.

New — the Frontier: a second world for mining & expeditions. Nothing extra to install, no second address: type /mining in-game to travel there, /main to come home. It resets from time to time — don't build your base there!

A “vanilla” Minecraft client is rejected automatically. You can't join without the modpack installed — that's normal, the server checks the mods on connection.

On TLauncher? Don't use its built-in modpack browser. The “Cogtopia” pack listed there is a fake by another author — it has the wrong mods and the server will reject it on join. Use an official method below; Prism Launcher works for free with offline accounts, just like TLauncher.

16 RPM Ø 284 1 2 3 FIG. 1-B · STRESS 4 CGT-01 / B
Fig. 1-A — Kinetic assembly 1 · Large cogwheel   2 · Cogwheel   3 · Pinion   4 · Stress gauge
// Technical dataREF. CGT-2026
  • NeoForgeLoader · 1.21.1
  • CreateModpack · Cogtopia SMP
  • Java 21Auto · nothing to do
  • Frontier2nd world · /mining in-game
  • Voice ChatIncluded · zero setup

Install the modpack

PL.01/04

A few ways to the same place. Prism and PolyMC are free and work with an offline account; the Modrinth and CurseForge apps need a premium Microsoft account. Pick one — you don't need them all.

Free · Offline OK REF. A

Prism / PolyMC

Any MultiMC-based launcher — import our ready-made pack

  1. 01

    Install Prism Launcher or PolyMC — both free & open-source.

  2. 02

    Add an account: Microsoft, or Offline by simply picking a username.

  3. 03

    Download our ready-made pack (button below) — one file, ~290 MB (all mods included).

  4. 04

    In the launcher: Add Instance → Import from zip, pick the file. It sets up NeoForge 1.21.1 and every mod for you.

  5. 05

    Launch, Add Server play.cogtopia.games, join. First time: /trigger register set <number>.

Download the pack (zip) Prism PolyMC
Microsoft account REF. B

Modrinth App

Open a .mrpack file — done

  1. 01

    Install the Modrinth App (free).

  2. 02

    Download our pack .mrpack (button below) — one file, ~290 MB (all mods included).

  3. 03

    Open the file with the Modrinth App (or in the app: + Add instance → From file). It sets up NeoForge 1.21.1 and every mod.

  4. 04

    Launch, then Add Server play.cogtopia.games and join.

Download the pack (.mrpack) Get Modrinth App
CurseForge · manual import REF. C

CurseForge App

Prefer CurseForge? Import our pack by hand — nothing to search.

  1. 01

    Install the CurseForge app (needs a premium Microsoft account).

  2. 02

    Download our CurseForge pack (button below) — a small ~20 MB file.

  3. 03

    In the app: Create Custom Profile → Import, pick the zip. It sets up NeoForge 1.21.1 and downloads every mod for you.

  4. 04

    Press Play, then Add Server play.cogtopia.games and join. First time: /trigger register set <number>.

Download the CurseForge pack (zip) Get CurseForge app

Ready-made pack — all mods bundled in one file. · based on Just Create SMP 2

Once connected

PL.02/04

Two last details the moment you arrive on the server — then you're free to build.

Protect your account

The server uses the Auth mod. On your first connection, type in chat (press T):

$ /trigger register set <number>

Your password is a number you choose (e.g. 2468) — set it once. To reconnect later: /trigger login set <number> (the same number).

Built-in voice chat

The server ships with Simple Voice Chat, already included in the modpack. No setup needed: plug in a mic and talk proximity-style with the players around you.

You can open the voice settings in-game with the V key if you need to pick your mic.

Having trouble?

PL.03/04

The most common blockers and how to get past them.

Q.01“Connection refused” or a screen that bounces you back to the menu

You're probably launching a vanilla Minecraft without the mods. The server only accepts the Cogtopia modpack: make sure you launch it from Prism Launcher, PolyMC, the Modrinth app or the CurseForge app, never from the plain official launcher.

Q.02Do I need to install Java myself?

No. Java 21 is downloaded and configured automatically by Prism Launcher, PolyMC, the Modrinth app and the CurseForge app. You don't have to touch anything.

Q.03I don't have a paid Minecraft account

Use Prism Launcher or PolyMC with an Offline account: you pick a username and you can play. The Modrinth and CurseForge apps, on the other hand, require a premium Microsoft account.

Q.04The server doesn't show up in my list

In Minecraft's multiplayer menu, click Add Server, give it a name, and paste the exact address play.cogtopia.games into the address field. No port to add.

Q.05Where's the official modpack page?

Right here on this page — see Install above (Prism, PolyMC, Modrinth or CurseForge), or grab it at cogtopia.events. Make sure the version is NeoForge 1.21.1.

Q.06I installed a “Cogtopia” pack in TLauncher and it won't connect

That pack in TLauncher's browser is not ours — it's a fake by another author with the wrong mods (you'll often see an error about Create: Connected missing on the server). Don't try to fix it mod-by-mod; install the official pack instead with Prism Launcher (free, offline accounts) from the Install section above, then add play.cogtopia.games.

Cogtopia logo

Support the server

Cogtopia is free and open to everyone. If you enjoy the server, you can support it — it helps pay for hosting and keep the project alive. Any amount, secure payment via Stripe. Thank you!

PL.04 — 04
Cogtopia — in-game server banner

Ready to build?

The modpack is installed, the account is ready. Copy the address, add the server, and join the workshop.

// SERVER Server address
play.cogtopia.games
Address copied: play.cogtopia.games