Core Keeper

Top-down underground survival. Mine resources, build a base, farm food, and defeat ancient bosses — all orbiting a mysterious glowing core. Built for co-op.

Developer	Pugstorm
Publisher	Fireshine Games
Release Date	August 27, 2023
Genre	Underground Survival / Co-op
Platform	PC (Windows, macOS, Linux), Console
Engine	Unity
Multiplayer	Up to 8 players co-op

Official Site ↗ Wiki ↗ Steam ↗

Core Keeper is a top-down underground survival game where you mine resources, build a base, farm food, and fight increasingly dangerous bosses — all while orbiting a mysterious glowing core.

Perfect for co-op. Sessions can be short or long depending on how deep you want to go.

Getting Started

Your first steps underground in Core Keeper

You wake up in a cave next to a giant glowing core with no idea what’s happening. Here’s what to do.

First 10 Minutes

Mine the rocks around you — copper and tin are everywhere near spawn
Craft a Workbench — opens up most early recipes
Make a Pickaxe — stone pickaxe first, upgrade to copper ASAP
Build a floor — place planks around your core so mobs don’t path through it
Find the first biome ring — grey stone caves, lots of copper ◆

Resource Priority

Resource	Colour	Use
Copper ◆	Brown	First tools & armour
Tin ◆	Light grey	Combine with copper for bronze
Iron ◆	Grey	Mid-tier gear
Gold ◆	Yellow	Better tools, decorative
Scarlet ◆	Red	Excellent mid-game armour set
Octarine ◆	Purple	Late-game crafting

Base Setup Tips

Build Walls + Doors — mobs can’t pass walls
Place Torches for visibility (and vibes)
Set up Chest storage early — inventory fills up fast
Grow Food using a hoe and seeds you find in dirt patches — healing matters

First Boss — Glurch

Glurch is the green slime blob in the first ring. You’ll find his lair by following green slime trails.

Server Info

How to join our Core Keeper world

Game ID

Ask in Discord for the current world ID

Platform

Steam — Core Keeper

Max Players

Dedicated Server

Hosted via Steamworks — always on

How to Join

Own Core Keeper on Steam
Get the Game ID from the Discord #corekeeper channel (changes when server restarts)
In-game: Play → Join Game → Enter Game ID
That’s it — you’re underground

The world is persistent. What you mine and build stays when you leave. Don't strip-mine shared areas without asking.

World Settings

Setting	Value
World Size	Large
Difficulty	Normal
Permadeath	Off
Season	Current in-game default

Current Biome Progress

Starting Caves — fully explored ✓
Azeos’ Wilderness — partially explored
Mold Halls — not yet reached
Sunken Sea — not yet reached

Bosses Defeated

Glurch the Abominous Mass ✓
Ghorm the Devourer ✓
Hive Mother — pending
Azeos the Sky Titan — pending