Solution: How many squares are there in a 9x9 Sudoku puzzle

Square within square

4x4 square = 1 + 4 + 9 + 16

5x5 square = 1 + 4 + 9 + 16 + 25

6x6 square = 1 + 4 + 9 + 16 + 25 + 36

7x7 square = 1 + 4 + 9 + 16 + 25 + 36 + 49

8x8 square = 1 + 4 + 9 + 16 + 25 + 36 + 49 + 64

9x9 square = 1 + 4 + 9 + 16 + 25 + 36 + 49 + 64 + 81 = 285

So there are 285 squares of all sizes in a Sudoku