Core Keeper features several hidden or less obvious biomes beyond the main three. These include the Sunken Sea, the Mold Biome, and the Crystal Biome. Each offers unique resources, enemies, and challenges. The Sunken Sea requires a boat to navigate and contains Octarine Ore. The Mold Biome is a dangerous, disease-ridden area with unique fungal creatures. The Crystal Biome is home to crystal-themed enemies and valuable minerals. Exploration is key to finding these areas and their treasures.
