I wrote this puzzle over three years ago as a follow up to my first difference arrows puzzle .
Each row, column & 3x3 box contains the digits 1-9.
Each circle has two attached arrows. The digit on the circle is equal to the sum of the digits along one of the arrows minus the sum of the digits along the other arrow.
CtC AppSolution code: Digits in all the circles from left to right, top to bottom.
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