Core Keeper server hosting for your mining crew
Dig, build and explore the caverns together on a world that is always there. Players join with a Game ID or the address, from Steam, Epic, GOG and the Microsoft Store.
- Official dedicated server for up to 8 players
- Join with a Game ID or by address and port
- Official mod support through mod.io
- Steam, Epic, GOG and Microsoft Store players together
- Players
- 1–8 per world
- JoiningWithout a port the server uses Steam’s relay and players join with the Game ID; with a port it switches to direct connect.
- Game ID or IP, port and password
- Version
- 1.3 Riders of the Underground
- Mods
- Official, via mod.io
- PC stores
- Steam · Epic · GOG · Microsoft Store
- World modes
- Normal, Hard, Creative, Casual
Options
- Game ID
- Direct connect
- mod.io
- Creative mode
- Cross-store PC
Game facts from Pugstorm’s update notes and the official Core Keeper modding documentation, checked in October 2026.
- DDoS protection
- 20 game server locations
Core Keeper plans are being prepared
Tell us your group size and mods, and our team will reply with the options. Or open a ticket and we will let you know when the plans are online.
How much RAM does a Core Keeper server need?
Core Keeper is a light server; explored world size and mods matter most.
Find your size
| Feature |
Small group
Up to 4 players
|
Recommended Full world
Up to 8 players
|
Modded
Up to 8 players with mods
|
|---|---|---|---|
| Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore. | 2 GB | 4 GB | 6 GB |
| CPU coresThe game simulates the world mostly on one thread, so fast cores matter more than many cores. | 2 | 2 | 2–3 |
| Disk spaceRoom for the game files, the world and its backups, plus updates and mods. | 5 GB | 10 GB | 10 GB |
| Typical use | Friends starting a new world | A full group deep into the game | mod.io mods for everyone |
-
Small group
Up to 4 players
- Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore.
- 2 GB
- CPU coresThe game simulates the world mostly on one thread, so fast cores matter more than many cores.
- 2
- Disk spaceRoom for the game files, the world and its backups, plus updates and mods.
- 5 GB
- Typical use
- Friends starting a new world
-
Recommended
Full world
Up to 8 players
- Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore.
- 4 GB
- CPU coresThe game simulates the world mostly on one thread, so fast cores matter more than many cores.
- 2
- Disk spaceRoom for the game files, the world and its backups, plus updates and mods.
- 10 GB
- Typical use
- A full group deep into the game
-
Modded
Up to 8 players with mods
- Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore.
- 6 GB
- CPU coresThe game simulates the world mostly on one thread, so fast cores matter more than many cores.
- 2–3
- Disk spaceRoom for the game files, the world and its backups, plus updates and mods.
- 10 GB
- Typical use
- mod.io mods for everyone
Pugstorm publishes no server hardware figures; these starting points follow common practice for an 8-player world.
Game ID, direct connect and mods
Everything your group needs to play together, whatever store they bought the game in.
Join with a Game ID
By default the server creates a Game ID and players join through Steam’s relay, without opening ports. Keep the ID fixed so it does not change.
Direct connect
Give the server a port and players on every PC store connect with the IP, port and password.
Official mods
Mods come from mod.io in the game menu. Everyone needs the same mods to play together.
World modes
Normal, Hard, Creative or Casual, with your own world name and seed.
Cross-store PC play
Since August 2025, Steam, Epic, GOG and Microsoft Store players can share one dedicated server.
Optional PvP
Since 1.0, PvP and teams can be switched on from the pause menu when your group wants a fight.
Set up your Core Keeper server
Four steps to an underground world that never closes.
-
Pick a size
Use the table above: most groups of up to 8 players are well served by 4 GB.
-
Pick a location
Choose the one closest to your group from our 20 game server locations.
-
Set the world
Choose the world name, seed and mode, keep the Game ID fixed and set a password if the world is private.
-
Invite your group
Share the Game ID, or the IP, port and password for a direct connection.
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Frequently asked questions
How many players can join a Core Keeper server?
Core Keeper is a game for 1 to 8 players, and a dedicated server keeps that world online for your group.
What is the Game ID?
A code the server creates so players can join through Steam’s relay without opening ports. Keep it fixed with the gameid setting; if it is empty or invalid, the server creates a new one at start.
Can players from Epic, GOG and the Microsoft Store join?
Yes. Since August 2025, PC players from Steam, Epic, GOG and the Microsoft Store can share a dedicated server using a direct connection with IP, port and password.
Can I use mods?
Yes. Core Keeper has official mod support through mod.io, and every player needs the same mods. Steam Workshop support opened as a beta in August 2026.
Can console players join my server?
Pugstorm has not announced crossplay between PC and consoles for dedicated servers. The cross-store support covers PC stores.
Do I need to open ports?
Not with the Game ID: the connection goes through Steam’s relay. If you give the server a port for direct connections, that port has to be reachable.
Which world modes can the server run?
Normal, Hard, Creative and Casual, each with your own world name and seed.
Is PvP possible?
Yes. Since version 1.0, optional PvP and teams can be turned on from the pause menu.
Ready to dig deeper together?
Tell us your group size and mods, and we will help you pick the right Core Keeper server.