Deep Hollow

Deep Hollow is a 1–4 player co-op cave exploration game.

You can report bugs, share ideas, any connected issue or suggestions on Discord.

Descend into a vast underground cave alone or with friends. Use ropes and other tools to navigate steep drops and tight underground spaces while searching for four lost tablet fragments. Bring all four to the stone pool deep below to complete the journey, explorers who reach the end leave their name behind in the cave.

Dangerous falling rock:

How to play with friends:

Jump into a random co-op session instantly, or invite friends directly, no complicated setup, 

Be careful, you may kill you friends:

Deep Hollow also features an asynchronous online system. Traces left by other players, markers, glowsticks, signs, may appear during your expedition, and the traces you leave behind can appear in someone else's run. Sometimes a stranger's trace is the difference between finding your way out or not. 

Current Demo

• 1–4 player online co-op
• Large interconnected cave environments
• Rope climbing and vertical exploration
• Underwater exploration
• Oxygen and stamina systems
• Relics and resources to discover
• Player signs and asynchronous traces
• A complete exploration objectiv

Bugs, unfinished content, and balance issues may still appear — this is an active work in progress, and feedback is genuinely how it gets better.

About the Future 

I'm developing Deep Hollow mostly on my own, and I plan to keep expanding it with new cave areas, mechanics, and things to discover underground. This demo is just the beginning, if it gets enough support, I hope to bring it to Steam and keep growing it from there. Whether you paid or played for free, thank you for giving it a try. Every download, comment, and bug report genuinely helps.