Core Keeper: Complete Biome Exploration & World Map Guide
Master the vast underground world of Core Keeper with comprehensive guides to all biomes, mapping techniques, exploration strategies, and hidden secrets. Navigate efficiently and discover every resource location in your mining adventures!
World Structure Overview
Core Keeper's underground world is procedurally generated but follows consistent biome placement patterns. Understanding these patterns is key to efficient exploration and resource acquisition.
World Generation Principles
🎯 Central Starting Area
Every world begins with a safe central area containing the Core and basic resources. This is your home base for initial exploration.
🌀 Concentric Biome Rings
Biomes are arranged in rings around the center, with difficulty increasing as you move outward from the Core.
🗺️ Procedural Variation
While biome order is consistent, exact layouts, cave structures, and resource placements vary with each world seed.
🔗 Connecting Pathways
Natural tunnels and cave systems connect biomes, but you can also dig your own passages for faster travel.
Every Biome in the Current Build
This table is read directly out of the shipped dedicated server, build 23543502: the names are the game's own localisation entries and the contents are its spawn tables, not a community list. The internal id is the name the server files use, which is what you will see in logs and in Conf/Spawn if you run your own world.
| Biome | Internal id | Spawn entries | Notable creatures and resources |
|---|---|---|---|
| The Clay Caves | Biome.Larva | 27 | Caveling Skirmisher, Caveling Spearman, Clay Burrower, Copper Ore Boulder, Giant Mushroom, Gold Ore Boulder, Mushroom, Stalagmite, Tin Ore Boulder, Wooden Crate |
| The Forgotten Ruins | Biome.Stone | 16 | Ancient Crate, Blue Glowbug, Caveling, Caveling Brute, Caveling Pot, Caveling Shaman, Copper Ore Boulder, Gold Ore Boulder, Iron Ore Boulder, Large Ancient Crate |
| The Undergrounds | Biome.Slime | 23 | Copper Ore Boulder, Fungal Soil, Giant Mushroom, Mushroom, Shrooman, Shrooman Brute, Stalagmite, Wooden Crate, Yellow Glowbug |
| Azeos' Wilderness | Biome.Nature | 33 | Ancient Feather, Azeos Lily, Bush, Caveling Gardener, Caveling Hunter, Copper Ore Boulder, Dodo, Flower Vessel, Gold Ore Boulder, Ground Poison Slime |
| The Desert of Beginnings | Biome.Desert | 32 | Bomb Scarab, Caveling Assassin, Copper Ore Boulder, Desert Flower Vessel, Desert Shrub, Dodo, Drohmble, Galaxite Ore Boulder, Giant Left-Facing Rock Arc, Giant Right-Facing Rock Arc |
| The Sunken Sea | Biome.Sea | 28 | Beached Jelly, Blue Slime, Bubble Crab, Driftwood Wooden Crate, Gem-Jellyfish, Green Glowbug, Ground Slippery Slime, Kelple, Land Algae, Large Beached Jelly |
| The Passage | Biome.Passage | 16 | Drape Ray, Fossil Cluster, Large Fossil Cluster, Pandorium Crystal, Pandorium Ore Boulder, Purple Feather Tree, Small Pandorium Crystal, Sulfur Bud, Sulfur Tree |
| Breaker's Reach | Biome.Excavation | 32 | Blue Glowbug, Broken Geobot Charger, Broken Geobot Patroller, Broken Geobot Swarmer, Decrepit Geobot Charger, Decrepit Geobot Swarmer, Dull Tree, Explosive Barrel, Geobot Miner, Geobot Patroller |
| The Shimmering Frontier | Biome.Crystal | — | no spawn table in this build |
| Great Wall | Biome.GreatWall | — | no spawn table in this build |
Ten biomes carry a player-facing name in this build. The enum holds two more: Biome.Obsidian and the internal Biome.None both resolve to "Unknown" in the game's own localisation table, so they are unreleased or internal rather than places you can visit today. The Dirt starting area around the Core is not in that enum at all; the build files it separately, under the category the game labels "Dirt biome", which is why it does not appear in the table above.
Biome Progression Order
Primary Biome Sequence
| Biome | Distance from Core | Difficulty Level | Key Resources | Primary Threats |
|---|---|---|---|---|
| Dirt Biome | 0-200 tiles | Very Easy | Copper, Tin, Stone | Basic Slimes, Low-level enemies |
| Clay Caves | 150-300 tiles | Easy | Clay, Sand, Early plants | Larger slimes, Burrowers |
| The Forgotten Ruins | 250-400 tiles | Easy-Medium | Iron, Gold, Ancient crates | Cavelings, Caveling Brutes, Caveling Shamans |
| The Undergrounds | 350-500 tiles | Medium | Copper, Fungal soil, Mushrooms | Shroomans, Shrooman Brutes |
| The Desert of Beginnings | 450-600 tiles | Medium-Hard | Galaxite, Iron, Gold | Bomb Scarabs, Caveling Assassins, Drohmbles |
| Azeos' Wilderness | 550-700 tiles | Hard | Scarlet Ore, Crystal, Rare gems | Powerful wildlife, Elementals |
| Shimmering Frontier | 650-800 tiles | Very Hard | Legendary materials, Magic items | Boss-level enemies, Environmental hazards |
Detailed Biome Guides
Dirt Biome (Starting Area)
📍 Location & Characteristics
Immediate surroundings of the Core. Soft dirt walls, basic cave structures, gentle slopes.
⛏️ Key Resources
Copper Ore, Tin Ore, Stone, Wood (from roots), Basic mushrooms, Berries
⚠️ Primary Dangers
Green Slimes (weak), Cave bats, Occasional burrowing worms
🎯 Exploration Tips
Establish perimeter walls, mark resource clusters, create organized tunnel networks
Clay Caves
📍 Location & Characteristics
Surrounding the dirt biome. Soft clay walls, water pockets, mushroom forests.
⛏️ Key Resources
Clay (for pottery), Sand (for glass), Glowshrooms, Water sources, Early crops
⚠️ Primary Dangers
Blue Slimes (stronger), Burrowing worms (damage walls), Spore clouds
🎯 Exploration Tips
Watch for collapsing ceilings, use torches in dark areas, collect glow mushrooms for light
The Forgotten Ruins
📍 Location & Characteristics
Stone halls and ancient brickwork, filed as Biome.Stone. This is the Caveling homeland and the densest early source of ore boulders.
⛏️ Key Resources
Iron Ore Boulder, Gold Ore Boulder, Copper Ore Boulder, Ancient Crate, Large Ancient Crate, Stone Moss
⚠️ Primary Dangers
Caveling, Caveling Brute, Caveling Shaman, Strolly Poly, and Caveling Pots that break into more of them
🎯 Exploration Tips
Cavelings come in groups and the Shamans heal, so kill those first. Ancient Crates are the reason to clear rather than pass through.
The Sunken Sea
📍 Location & Characteristics
A flooded region of shallow water, kelp and coral, reached past Azeos' Wilderness. The build files it as Biome.Sea.
⛏️ Key Resources
Octarine Ore Boulder, Lumen Coral, Sea Shell, Land Algae, Kelple, Driftwood Wooden Crate
⚠️ Primary Dangers
Bubble Crab, Gem-Jellyfish, Beached Jelly, Blue Slime, Ground Slippery Slime, Tentacle
🎯 Exploration Tips
Slippery slime changes how you move here, so bring movement gear and expect to be pushed off course near water.
Breaker's Reach
📍 Location & Characteristics
An industrial region of derelict machinery and robotic guardians, filed as Biome.Excavation, with 32 spawn entries in the current build.
⛏️ Key Resources
Metal Industrial Box, Metal Barrel, Explosive Barrel, Metal Barricade, Glowing Mushroom, Dull Tree
⚠️ Primary Dangers
Geobot Miner, Geobot Patroller, Geobot Scourer, and the Broken and Decrepit Geobot variants
🎯 Exploration Tips
Explosive Barrels sit among the scrap here, so area damage can chain further than you intended.
Advanced Biome: Azeos' Wilderness
Environment Overview
Azeos' Wilderness is a magical biome filled with glowing plants, floating islands, and crystalline structures. This is where you'll find the rarest resources and face significant challenges.
Key Sub-Regions
- Crystal Forests: Dense areas of glowing crystals. Rich in gemstones but guarded by crystal golems.
- Floating Islands: Suspended landmasses connected by bridges or requiring flight. Contain unique resources.
- Ancient Gardens: Overgrown with magical plants. Source of rare alchemical ingredients.
- Scarlet Veins: Deep trenches filled with scarlet ore. Extremely dangerous but essential for end-game gear.
Mapping & Navigation Systems
Mapping Tools & Techniques
🗺️ Basic Mapping
Use torches, signs, and colored blocks to mark paths and important locations manually.
📡 Advanced Cartography
Craft mapping tables, compasses, and GPS devices for automated map creation.
💾 Digital Mapping
Use in-game mapping software or external tools to create detailed world maps.
🎨 Marking Systems
Establish color-coded marking systems for different resource types and danger levels.
Effective Marking Conventions
- Red: Danger areas, enemy nests, boss locations
- Green: Safe zones, base locations, farming areas
- Blue: Water sources, fishing spots, underwater resources
- Yellow: Resource clusters, mining sites, ore deposits
- Purple: Magic areas, enchantment spots, rare materials
- White: Unexplored boundaries, mapping progress indicators
Exploration Equipment
Essential Exploration Gear
| Equipment | Purpose | Crafting Requirements | Exploration Tier |
|---|---|---|---|
| Basic Torch | Light source for dark areas | Wood ×1, Coal ×1 | Early Game |
| Glowing Mushroom Lamp | Permanent light source | Glowshroom ×3, Clay ×2 | Early Game |
| Compass | Direction finding | Iron Bar ×2, Glass ×1 | Mid Game |
| Depth Meter | Altitude measurement | Gold Bar ×3, Crystal ×1 | Mid Game |
| GPS Device | Exact coordinates | Scarlet Ore ×5, Circuit ×3 | Late Game |
| Sonar Scanner | Resource detection | Crystal ×10, Battery ×5 | Late Game |
Secret Areas & Hidden Content
Common Hidden Location Types
🚪 Hidden Passages
False walls, breakable blocks, or illusionary barriers that conceal secret rooms.
🔑 Locked Chambers
Rooms requiring specific keys, boss defeats, or puzzle solutions to access.
🌀 Puzzle Rooms
Challenges requiring specific item combinations, timing, or pattern recognition.
💎 Resource Caches
Carefully hidden stashes of valuable materials, often behind environmental puzzles.
Discovery Techniques
- Wall Testing: Mine suspicious wall sections that look different
- Pattern Recognition: Look for unusual block arrangements or symmetry
- Sound Cues: Listen for hidden water, machinery, or creature sounds
- Light Analysis: Check for light sources behind thin walls
- Map Analysis: Unexplored gaps on your map may indicate hidden areas
Danger Management
Environmental Hazards
💥 Cave-Ins
Unsupported ceilings may collapse. Use support beams and avoid mining directly upward.
🌊 Flooding
Breaking into water pockets can flood tunnels. Have drainage plans and water pumps ready.
🔥 Gas Pockets
Flammable or toxic gases in certain areas. Use ventilation and gas detection equipment.
❄️ Temperature Extremes
Some biomes have extreme cold or heat. Wear appropriate clothing and bring temperature regulators.
Multiplayer Exploration Coordination
Coordinated expeditions work best when the world stays online around the clock, so teammates can pick up mapping and resource runs whenever they log in. Enjoy persistent co-op survival worlds? Supercraft also runs a managed Core Keeper server plan, keeping your underground world online 24/7 with automatic backups.
Team Exploration Strategies
- Scouting Parties: Small teams exploring different directions simultaneously
- Base Camp Network: Establish forward bases in each major biome
- Resource Specialization: Assign team members to focus on specific resource types
- Mapping Collaboration: Shared mapping systems with coordinated marking conventions
- Emergency Response: Designated rescue teams for exploring party emergencies
Communication Systems
- Radio Networks: Craft walkie-talkies for long-distance communication
- Signal Flares: Visual signals for emergencies or important discoveries
- Message Boards: Physical boards at base camps for leaving notes
- Map Annotations: Shared digital maps with team notes and markers
Biome-Specific Exploration Tips
For Each Major Biome
Dirt & Clay Biomes: Focus on establishing infrastructure. Create wide, well-lit tunnels with clear marking systems. These areas will become your main transportation network.
The Forgotten Ruins: Cavelings arrive in groups and the Shamans heal the rest, so open on the Shaman. Caveling Pots break into more of them, which is what turns a clean fight into a bad one.
Breaker's Reach: The Geobots patrol rather than wander, so a route learned once stays true. Explosive Barrels sit among the scrap and chain further than you expect.
Azeos' Wilderness: Plan expeditions carefully. Bring ample supplies, backup equipment, and escape routes. The rewards are great but the dangers are significant.
Mapping Software & Tools
Recommended External Tools
- Core Keeper Map Viewer: Community tool for visualizing world maps
- Biome Scanner Mod: In-game mod that helps identify biome boundaries
- Resource Tracker: Database tool for logging resource locations
- Coordinates Manager: Save and organize important coordinate sets
Manual Mapping Techniques
- Grid System: Divide the world into manageable grid sections
- Progressive Exploration: Systematically explore one grid at a time
- Documentation: Keep detailed notes of discoveries in each area
- Regular Updates: Continuously update maps as new areas are explored
Troubleshooting Exploration Issues
❌ Getting Lost Frequently
Improve marking systems, use consistent tunnel designs, craft navigation tools, create detailed maps.
⚡ Running Out of Supplies
Establish supply caches along exploration routes, use portable crafting stations, plan expeditions with adequate resources.
🔄 Inefficient Exploration Patterns
Adopt systematic exploration methods (spiral, grid, radial), use scout drones if available, prioritize high-value areas.
💎 Missing Hidden Areas
Use detection equipment, pay attention to environmental clues, revisit areas with new tools, consult community maps.
Pro Tip: Always carry mapping supplies (torches, signs, markers) on every expedition. Consistent marking and documentation will save you countless hours of backtracking and rediscovery!