On even board to flip a square, hit square and hit all other squares in the same row and all other squares in the same column. To flip 4 squares in a 2 x 2 arr

On even board to flip a square, hit square and hit all other squares in the same row and all other squares in the same column. To flip 4 squares in a 2 x 2 arrangement, hit all of those 4 squares. What makes the bigger grids hard is the size of my little finger.