Exercise Your Brain!
Are you good at remembering numbers?
How many numbers can you remember?
Try this experiment to test your digit span, the maximum number of digits that you can remember.
Type the digits in the correct sequence.
After pressing Start button, a random digit will disappear for a short time(e.g. 3), then you enter that digit(3).
Then the second random digit will disappear(e.g. 8) and you should enter the first(3) and the second(8) digits.
Then the third random digit will disappear(e.g. 7) and you should enter the first(3), the second(8) and the third(7) digits and ....
The game continues as long as you can remember the numbers.

You try to play and let us know your comments below.
Thanks!

Screenshots: