Payam, this is a good puzzle, but the code in the template and the test suite gives away the answer. I suggest removing the code from the template and checking the validity of the answer by applying the rules to rows, columns, and 3x3 squares.
Add two numbers
Try 1.5.4: Celsius to Fahrenheit
Sum the 'edge' values of a matrix
Height of a right-angled triangle
Draw a 'X'!
find the height
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