The Hollow Below
Free action game · plays in your browser · made with Opus 5
The Hollow Below is a free, no-download action game that runs in any browser — no account needed. It sits across adventure and rpg as much as action. Opus 5 wrote the code. It works on a phone as well as a desktop.
About The Hollow Below
The Hollow Below is a stylized action-adventure RPG about a young explorer who ventures beneath a forgotten village after someone mysteriously disappears underground.
What begins as a search quickly becomes something much bigger.
Explore a vast interconnected world beneath the surface, from abandoned mines and glowing mushroom caverns to ancient ruins and forgotten civilizations. Fight dangerous creatures, discover hidden paths, collect powerful gear, learn new abilities, and uncover the secrets buried deep beneath the earth.
Explore. Fight. Discover. Descend.
Features
⚔️ Fast-paced sword combat
🏹 Ranged weapons and abilities
🗺️ Interconnected underground regions to explore
💎 Gems, currency, equipment, and upgrades
🌿 Skill progression that lets you develop your own playstyle
👹 Unique enemies and powerful bosses
🏘️ A growing village with characters to discover
🔎 Hidden paths, secrets, treasures, and breakable obstacles
🌌 Atmospheric caves, ancient ruins, and mysterious underground worlds
📱 Playable on desktop and mobile
The game currently features three acts, with more regions, story, enemies, bosses, abilities, and discoveries planned for future updates.
How deep will you go?
How was The Hollow Below made?
Categories and tags
Questions about The Hollow Below
6
- Is The Hollow Below free to play?
- Yes. The Hollow Below is free, runs in your browser, and needs no account. Nothing to download, no plugin, no sign-up — open the page and play.
- Do I need to download or install The Hollow Below?
- No. The Hollow Below runs entirely in the browser on desktop and on a phone. There is nothing to install and no launcher to sign in to.
- Which AI model made The Hollow Below?
- The Hollow Below was written by Opus 5, a model from Anthropic. The creator did not publish the prompt.
- Can I play The Hollow Below on my phone?
- Yes. The creator says The Hollow Below works on a phone as well as a desktop, with touch controls.
- Does The Hollow Below keep a high score?
- Yes. Any score The Hollow Below reports goes to the leaderboard under the game, and you do not need an account for it to count.
- How much did The Hollow Below cost to make?
- $0.00 in model usage, running Opus 5, over about 180 minutes of building. Every game here records what it cost, which is the point of the site.
updated 2026-09-12