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Fill in each square with a digit from 1 to 9. The sum of the digits in each row or column will equal the little number to the left of or above it. See the three-square row at the top left with a 14 to the left of it? The sum of the digits in those three squares will be 14, and none of the digits will be the same. A row or column ends at a black square, so the four-square row in the upper-right with a 25 may or may not have digits in common with the 14-row to its left since they’re separated by a black square. Down columns work the same way. Now solve!!
