Core Keeper connects players via a Game ID. Here you'll learn where to find it and which settings matter.

Connecting

Start the server on the server page with Start.
Wait until the status shows “running”. You can follow the progress in the Console tab.
Find the Game ID: it appears in the Console tab after starting and is stored in the file GameID.txt in the Files tab.
In the game, choose “Join game” and enter the Game ID.

Important settings

World name (WORLD_NAME) – the name of your server.
Game ID (GAME_ID) – fixed ID for the server (at least 28 characters, letters and numbers only, without Y, y, x, 0, O). Leave it empty and a new ID will be generated on start.
Max. players (MAX_PLAYERS) – at most 100.
World seed (WORLD_SEED) – seed for a new world; 0 = random.
World mode (WORLD_MODE) – 0 = normal, 1 = hard.
World index (WORLD_INDEX) – which world save is used.

Changes to the Startup variables take effect on the next restart.

How your friends join

Core Keeper does not connect via IP and port but via the Game ID:

Start the server. The Game ID is then shown in the Console.
In the game, your friends choose Join and enter the Game ID.

Then enter the ID permanently in the Game ID startup variable. Otherwise the server gets a new one on every restart and everyone has to enter it again.

Several worlds

With World index you choose which world save is loaded. A new index creates a new world; the previous one is kept. This way you can, for example, have a normal and a hard world (World mode 1) side by side.

How much memory?

The base configuration is enough to start. The more players play at the same time and the more of the world has been explored, the more memory the server needs.

Good to know

If Game ID is empty, the ID may change. Enter a fixed ID so your fellow players can always use the same one.
On first start, the server downloads the game files. This can take a few minutes – please don't interrupt it.

Core Keeper: Connecting to and setting up your server