The Undergrounds

The Undergrounds is the biome the player first spawns in, and it serves as the game’s introductory underground region. It is also known as the Dirt Biome. The area is designed to be low difficulty, with enemies that are generally slow and predictable, making it a natural place to learn Core Keeper’s basic survival, mining, and combat systems.

The biome is made up mainly of Dirt, Turf, and Sand blocks, which are soft enough to break with bare hands or a weak pickaxe. Normal water is common here, forming rivers and lakes throughout the terrain. The Undergrounds generates in a rough circular shape at a distance of 0–150 tiles from the Core, and small patches of the Meadow sub-biome can appear within it.

Because it is the starting area, the Undergrounds is usually the first place where players gather early resources and meet the game’s simplest hostile creatures and critters. It can also contain unique terrain-related items and fishing catches tied to normal water in the biome. As the safest and most familiar region, it often functions as the player’s first long-term base area before they push outward into more dangerous biomes.

A few practical details stand out when exploring the Undergrounds:

• Its terrain is easy to reshape early on, since the common blocks can be broken with basic tools.
• Normal water in this biome supports its own fishing results.
• The biome is the only one that does not show its name in the top-right of the fullscreen map.
• Small Meadow patches may interrupt the otherwise dirt-heavy landscape.
• Even though it is the starting biome, it still contains enough variety to support early exploration, gathering, and base-building.

The Undergrounds is therefore more than just a tutorial space. It establishes the game’s underground atmosphere, introduces its basic environmental rules, and provides the first stable foundation for progression before the player moves deeper into the world.