Try to whack the numbers when they appear in the right square!

3 x 3: 9 squares, whack the numbers from 1 to 9 when they appear in the right square.

5 x 5: 25 squares, whack the numbers from 1 to 25 when they appear in the right square.

7 x 7: 49 squares, whack the numbers from 1 to 49 when they appear in the right square.

9 x 9: 81 squares, whack the numbers from 1 to 81 when they appear in the right square.