The answer is 30.
The grid is 4 by 4, and the squares hide inside each other:
- 16 smallest squares (1×1)
- 9 squares made of four small ones (2×2)
- 4 squares made of nine small ones (3×3)
- 1 big square around the whole thing (4×4)
16 + 9 + 4 + 1 = 30 squares.
Most people stop at 16 or 17 (the small ones plus the outside). The 2×2 set is the one almost everybody misses — there are nine of them. How many did you get? Tell us in the comments, then try the triangle puzzle on our page.
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