Hollowmere
Free action game · plays in your browser · made with Opus 5
Hollowmere is an action game you can play free in your browser — no download, no account, nothing to install. It sits across puzzle and adventure as much as action. It was written by Opus 5.
About Hollowmere
🕯️ HOLLOWMERE
Here the road ends.
And the Hollowmere begins.
Travellers: turn back. Or leave your name upon the stone.
You wake in a broken vault beneath a kingdom that has forgotten how to remember itself.
You have a nail. You have no name. And the only path left leads down.
🕯️ Hollowmere is an atmospheric, hand-drawn Metroidvania adventure that runs entirely in your browser — an underground kingdom of 86 interconnected rooms, built to be explored sideways, downward, and wherever your curiosity takes you.
There is no straight path.
There is only the descent.
🌑 THE DESCENT
🌿 Rootway Depths
Root-choked caverns where pilgrims once descended toward the Choir.
Something still walks the path they left behind.
🌊 The Drowned Cloister
A flooded nave beneath a shattered belfry.
The bells are silent.
But the last note is still being held.
🔥 The Emberworks
Furnaces nobody banked.
A shift that never ended because nobody remained to tell it that it had.
🪞 The Glasswood
A forest grown from glass.
Beautiful.
Fragile.
And more than happy to open you up.
⛓️ The Weeping Gaol
Rows of empty cells.
And something that kept them.
You don't have to go here.
You will want to.
⚪ The Pale Hollow
The bottom.
The place where the kingdom's final question was answered.
Something answered back.
👁️ SIX WHO REMAIN
Six figures still stand at their posts.
Six guardians who have waited far longer than anyone should have to wait.
⚔️ The Hollow Warden Gaoler of the Rootway
🎵 The Pale Cantor Who Held the Last Note
🔥 The Forgewrought Last Shift of the Emberworks
🌹 The Thornwright Who Kept the Glasswood
⛓️ Marrow Who Kept the Cells
👑 The Pale Sovereign That Which Answered
They don't simply attack.
They telegraph.
They commit.
And then, for a heartbeat, they leave you a window.
Learn the window, and the fight becomes a dance.
Ignore it—
and it becomes a wall.
✨ WHAT THE
How was Hollowmere made?
Categories and tags
Questions about Hollowmere
6
- Is Hollowmere free to play?
- Yes. Hollowmere 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 Hollowmere?
- No. Hollowmere runs entirely in the browser on desktop. There is nothing to install and no launcher to sign in to.
- Which AI model made Hollowmere?
- Hollowmere was written by Opus 5, a model from Anthropic. The creator did not publish the prompt.
- Can I play Hollowmere on my phone?
- Hollowmere has not been marked as working on phones, so it is best played on a desktop or laptop.
- Does Hollowmere keep a high score?
- Yes. Any score Hollowmere reports goes to the leaderboard under the game, and you do not need an account for it to count.
- How much did Hollowmere cost to make?
- $0.00 in model usage, running Opus 5, over about 3 minutes of building. Every game here records what it cost, which is the point of the site.
updated 2026-09-14