Squares of Doom: Subtraction introduction

Description:
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!
Instructions:
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!
Control Scheme:
fire: na
jump: na
movement: mouse

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