Halcyon
by · built with an AI coding agent · plays free at halcyon.billpwchan.art
Free, no install, runs in the browser. Hosted by its creator at halcyon.billpwchan.art — the link opens their site, not a copy on ours.
What Halcyon is
Halcyon is a exploration game by None. Walk, swim, sail and fly around a tropical atoll from sunrise to bioluminescent night, with an FFT ocean, a peak from real lidar and 43,000 scanned plants. Built with Claude Code · Three.js. It is a 32.1 MB download that loaded in 3.8s when we tested it and renders with WebGL.
Halcyon: measured
We loaded Halcyon in a real headless Chrome, played it, and recorded what it did. Blank cells are facts we could not measure, not zeros.
| Download | 32.1 MB | Total bytes fetched on first load. |
|---|---|---|
| Loads in | 3.8s | Time to the load event on a desktop connection. |
| Renderer | ANGLE (NVIDIA, NVIDIA GeForce RTX 4070 Laptop GPU (0x00002860) Direct3D11 vs_5_0 ps_5_0, D | What the game draws with. |
| Requests | 35 | Files fetched — a low count means a self-contained build. |
| On a phone | Fits a 390px screen | Measured in a 390×844 viewport. |
Method and the full comparison: how we measured these games · what games like this cost to build.
Controls
Read from the game’s own page. Check in-game for the full scheme.
Halcyon FAQ
Is Halcyon free to play?
Yes. Halcyon is free and runs in your browser at halcyon.billpwchan.art — no download, no install and no account. It was made by None.
What kind of game is Halcyon?
Halcyon is a exploration game. Walk, swim, sail and fly around a tropical atoll from sunrise to bioluminescent night, with an FFT ocean, a peak from real lidar and 43,000 scanned plants. Built with Claude Code · Three.js.
Does Halcyon work on mobile?
It fits a phone screen — we measured no horizontal overflow in a 390×844 viewport. We did not detect touch controls, so a keyboard and mouse may still be needed.
How big is Halcyon?
32.1 MB on first load, across 35 requests, loading in about 3.8 seconds.
Who made Halcyon?
None, using an AI coding agent. It is one of 393 games built this way that we catalogue and measure.
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Phantasy Claude Online
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Voxelcraft
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Halcyon was made by and is hosted on their own site at halcyon.billpwchan.art. EveryGameMade does not host or claim this game — this page is a catalogue entry, the screenshot is a frame we captured of it running, and the specs are our own measurements. Creators: get in touch to correct or remove an entry.