Here is an example of a 4 by 4 Latin square:
Can you see what is going on?
In the grid below, N is a 6 digit number with a very special property:
if you double the number and write it in the second row,
treble the number and write it in the third row,
and so on...
you end up with a Latin Square!
Can you find the six digit number N?
If you're finding it difficult to get started, click below to see a diagram showing one possible order in which you can work out each value.