The numbers appear in pairs on a screen and disappear after being exposed for
4 seconds. Once they have disappeared, the participant must write them down
on a piece of paper in the correct order.

Here is an example of how the 16-digit number will appear:

89 31 20 43 70 51 32 47

After 20 digits (the minimum to become Master), the scores can go up by
half-digits, just like in the 1-second number test.

So, for a participant to earn 21.5 digits, for example, they would have to have
earned 21 digits straight through, and then tried to do 22 or more digits and
miss by only one digit.

The tests will start with 6 digits in the "child" category (up to 10 years old), and
with 8 for the rest. Thereafter the digits will increase one by one.