40 matchsticks are arranged to form a 4 by 4 grid of 16 smaller squares, 4 matchsticks to a small square.

What is the fewest number of matchsticks that need to be removed so that there are no squares (of any size) remaining?

1 answer

https://curiosity.com/topics/can-you-solve-the-matches-grid-puzzle-curiosity/

there are a number of solutions. Do it.