A little time, kept.

Moonminute is an original idealized hourglass puzzle. Time advances only when you choose Next emptying. Turning replaces a glass’s remaining time r with capacity minus r; an event advances all running glasses together by the smallest positive remaining time. Bells are exact timestamps from the watch’s start.

Eight authored watches have shortest routes of 6, 9, 11, 8, 13, 13, 15 and 16 actions. Undo is free. Nudges suggest one exact shortest-route action and are marked as assisted. Sand height preserves the chamber’s displayed area fraction, but this is not granular or microgravity physics.

GitHub background reference: iterami/Countdown.htm, 1 star observed November 13, 2026, CC0-1.0, maintained September 11, 2026 (browser event handling). Its unrestricted add-time countdown game was rejected as a direct candidate. No upstream code, styles, models or assets are bundled.

Recent thematic inspiration: Vibration-assisted granular flow under simulated lunar conditions, published November 9, 2026. It inspired the lunar sand-and-glass setting only. Our idealized clock rules do not implement that research.

Original implementation: MIT License. Two GPT Image generations supply the local observatory backdrop and golden sand texture. The sand texture fills the actual changing top and bottom chambers. No remote assets are required.

Metadata tags: github-source, game. Machine-readable provenance.

Only eight whitelisted completion records, best action counts and gold flags may be stored on this device. Optional chimes are synthesized locally. No account, authentication, backend, exports, downloads or external resources are needed for play.