Crystal Hollow
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There is always something underneath.
Follow a bright seam into a forgotten cavern. Build a mining crew, crack open geodes, and uncover the hidden history below a sleepy mountain.
How to play Crystal Hollow
A blue glint catches your eye beneath the old quarry. Tap the crystal, gather a few shards, and set up your first mining tool.
- Mine the crystal by clicking or tapping the main play area. You can also press Space while playing.
- Spend shards on helpers, starting with the Pocket Pick. Helpers produce resources automatically.
- Use Craft, Explore, and Mastery research to choose your next improvement.
- Open The Deep Dig. Drill to earn survey marks, then improve your excavation crew. Each newly reached layer holds a specimen to uncover and collect.
- Follow the story through ten chapters. Later, New Expedition lets you begin again with permanent keystones.
A world that fits your time
Helpers start with 50% offline efficiency and room for up to 12 hours of earnings. Research and permanent skills can improve those limits. Finished activities wait until you collect them.
Play free without an account or purchases. Your profile and progress are stored in this browser. Export a backup from Save & settings before moving devices or clearing browser data.
A useful first step
Drilling earns survey marks. Spend them to raise your excavation level and improve rewards.
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