A LITTLE WATCH BETWEEN EARTH AND DAWN
Turn a glass. Borrow a minute.Let the next last grain find you.
The clocks wait for you. No real-time countdown.
WELCOME, LITTLE TIMEKEEPER
Each glass has a fixed capacity. Its label tells you the sand remaining above the neck. Turn it to swap the amounts above and below.
Turning and ringing take no virtual minutes. A glass with equal halves is unchanged by a turn. If you pass a bell, undo is free. There is no real-time pressure.
Keys: 1–3 turn glasses, Space skips to the next emptying, B rings, Z undoes, H suggests one shortest-route action. Any watch is open for practice.