A stone slides along the track and slows to a stop. Tap the numbered zone you think it will stop in before it settles. Call the right zone and you advance to the next, harder round; call the wrong one, or let it stop before you commit, and the run ends.

What is the reaction time?

The reaction time is how many milliseconds passed between the launch and your call. Calling it correctly while the stone is still fast gives a low (fast) time; your fastest correct call is saved locally in your browser so you can try to beat it.

Should I call it early or wait?

That is the whole game. Early calls score a faster reaction time but are riskier, because a fast stone is hard to read. Waiting until it nearly settles makes the right zone obvious but your time is slow · and if you wait too long it stops before you commit, which ends the run.

Yes. The board stays exactly the same size, but each correct call launches the stone faster on the next round · the window tightens, so you have less time to read where it stops the further your streak runs.

Does it work offline?

Yes · Coast is part of the PlayMemorize Progressive Web App. Install once and play anywhere, even with no connection.

Coast · Μάντεψε πού θα σταματήσει · Ελληνικά

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Watch a stone coast to a stop and tap the zone it lands in before it settles · call it early for a faster reaction time. JavaScript required.

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