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periplus

A free exploration game — play it in your browser, no install. A game-jam entry on the theme 'explore'. Walk an unmapped moon — the ground is only contour lines until you stand next to it. Procedural 3D, no assets, one HTML file.

by @TonyDowney · TonyDowney/periplus on GitHubLANG JavaScriptHOSTED ON TONYDOWNEY.GITHUB.IOUPDATED 26 Jul 2026

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Best with a keyboard. Controls: W A S D: walk · mouse to look (click the canvas to capture the cursor)

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From the README

a survey of one small world — a game-jam entry on the theme explore.

Needs WebGL2, a keyboard and a mouse. No install, no server, and no network calls once the page has loaded.

A periplus is the older thing a map is made of: a list of what you passed, in the order you passed it, written by someone who was actually there. This one is blank.

You are set down on an unmapped moon with an instrument that writes down only the ground you personally stand next to.

Read the full README on GitHub →

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