Eyes & attention

Number flash

Read the number before it disappears.

Ready when you are.

How to play

Start with three digits shown for about half a second. Later levels change the digit count, exposure and brightness. Enter the whole number, including any leading zero: the last digit submits automatically. Correct answers advance automatically. After a mistake, you can retry the same level with a new number once per run, keeping your points, or finish. From level 35 onward, the game continues with 14 digits and the shortest display setting.

Controls

Use touch or a mouse. Keyboard controls appear inside games that support them.

About your score

Each correct answer adds 100 × its level, plus a speed bonus from 0 to 50 points. The bonus is 50 within one second after the number disappears, decreases linearly to zero at nine seconds, and is rounded to a whole point. Failed answers add no points. Display times depend on the screen and browser; the shortest setting targets about 17 ms.

Scores describe this game on your device. They are not a medical test or a comparison with everyone else.

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Number flash

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