Every now and then, I enjoy creating a puzzle or two. Often, these puzzles involve
squares of numbers. The following puzzle is a personal favourite of mine. If you
enjoy puzzles, feel free to give it a try:

Need more challenge? Try answering the following question: “How many unique arrangements of the numbers 0 through 8 in the green tiles exist for which all visible numbers are positive integers?”

If you manage to answer both of these questions correctly and know that my birthday is March 13, you will realize why I particularly like this puzzle.

7

3

5

9

4

6

0

10

8

1

2

?

11

8

3

Need more challenge? Try answering the following question: “How many unique arrangements of the numbers 0 through 8 in the green tiles exist for which all visible numbers are positive integers?”

If you manage to answer both of these questions correctly and know that my birthday is March 13, you will realize why I particularly like this puzzle.