Absolute Brain Puzzle

A simple rule subtraction puzzle with an "absolute value" motif. If you overlap two numbers, it will change to the difference. Bold at the beginning and cautious at the end. .. .. Please enjoy the pleasure of erasing all the numbers. You can enjoy three modes : (At first, only (1) can be played) (1) Time Attack Light: Enjoy easy puzzles, with a time limit (2) Time Attack Classic: Challenge…