Squares Of Doom Subtraction

Gray Open, Black Total. Hover over a box. Type a number. Box A Box A, Box B Box B, and so on. Highest possible number is the current level. Have fun! Solve each of the 10 levels by filling in the gray squares to make the difference of the black squares, both rows and columns. Careful though boxes can have a pair that must contain the same number. Give the game your best shot!