On the screen soon will be shown circles (dots) at high speed.

The number of circles will vary by case.

Please look at the screen and try counting how many circles will appear on the screen.

Immediately before each dots appear, the cross will flash several times in the center of the display.

Beware, the circles will show very briefly and only once, so the same task can not be displayed again.

After the dots disappear, type the number of dots and wait for the next task.

At the end of the research, you will be informed about your results.

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Choose the difficulty level:

Default     Light     Medium     Hard     Very hard     Extreme

Number of tasks: 10

Click on Start button to begin.