NAGARE is MIKIRI's moving-number game. A number enters from the right edge of the screen and sweeps across to the left. Once it has gone, you type what you saw. It is the most literal version of dynamic visual acuity in MIKIRI: FLASH shows a still number for an instant, NAGARE makes you read a number that is moving.
Each round makes only one thing harder — the speed or the number of digits — and rounds that add a digit slow the pass down slightly. Miss, and the same number plays back in slow motion with how many leading digits you caught, so you can see exactly where your reading broke down. You have two lives.
▶ NAGARE — Play free nowRound 1 is 3 digits passing in 1.6 seconds. Round 13 (elite) is 5 digits in 0.65 seconds, round 21 (demon) is 7 digits in 0.34 seconds, and round 28 (beyond human) is 10 digits in 0.38 seconds. From round 35 it stays at 12 digits in 0.24 seconds. The pass time is measured from when the first digit enters to when the last digit leaves, and it does not depend on your screen's refresh rate.
There are two ways to read a moving number. You can chase it with your eyes, or you can hold your gaze at one point in the lane and catch it as it passes. At slow speeds both work. As it speeds up, eye movements can no longer keep pace, and holding still becomes the more reliable strategy.
The second skill is the short memory that holds the digits until you type them. Because the number has gone before you answer, the load grows with every extra digit. FLASH asks you to read a single instant image; NAGARE asks you to stitch together information you picked up over several moments while it moved.
Chasing from the right edge. If you watch where the number enters, your eyes travel with it and you lose the last digits. Rest your gaze near the middle of the lane and let the whole number pass through it.
Reading digit by digit. Beyond six digits there is not enough time. Taking it in as chunks — "503 · 81" — holds up much better.
Skipping the slow replay. The "first N digits caught" line shows exactly where your reading broke down. If you always lose the end, you are starting too late; if you lose the start, you are noticing the number late.
Pass time is calculated from elapsed time, so the number takes the same time to cross on a 60Hz or a 120Hz screen. What changes is smoothness: at 120Hz the digit shapes are easier to pick up.
A wider screen also makes the same pass time look faster. Phone and tablet, portrait and landscape are different conditions, so compare results on the same device held the same way.