Karst Hollow

Karst Hollow is a fast, physics driven descent game about timing, risk, and treasure. Hold to grab the next ledge, release to fall deeper, collect crystals on the way down, then find the lift and return to the surface with everything you found. Every descent is a choice. Push a little farther for rarer crystals, or turn back while your gear still has the strength to survive.

The hollow is a living cave system carved by centuries of water and pressure. It starts calm near the surface, then turns colder, hotter, and stranger the deeper you go, ending in a bottomless void where only the boldest explorers dare to search. Along the way you will face moving ledges, fire, poison gas, unstable rock, and other hazards that punish careless falls and reward precise timing.

Karst Hollow includes four ways to play. Classic Descent is the core experience, where you balance depth against your gear's durability. Time Trial adds a countdown and higher rewards for players who move fast. Zen Practice removes damage and pressure entirely, so you can explore at your own pace. Daily Challenge drops every player into the exact same shaft once a day, so you can compare your run against friends on equal footing.

As you collect crystals you can upgrade your gear between runs. Strengthen your hull to survive more hits, improve your grip to grab ledges faster and fall more safely, extend your fuel cell to last longer underground, and grow your luck to find rarer crystals more often. Every crystal you discover joins your permanent collection, and locked entries show how deep you need to go to find them.

Climb four separate leaderboards built from your own history, covering your crystal collection, your total earnings, how efficiently you play, and the deepest point you have ever reached. There is no online multiplayer and no comparison with strangers, just a clear record of your own progress over time.

Karst Hollow works completely offline. All progress is saved locally on your device. There is no account, no login, no advertising, no tracking, and no in app purchases of any kind. Every crystal, every upgrade, and every meter of depth is earned purely through play.