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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 or above it. You can’t repeat any digits within a row or column. See the four-box row in the top left with a 13 to the left of it? The sum of those boxes will be 13. A row or column ends at a black square, so the five-square row in the upper-right corner with a 30 may or may not have digits in common with the 13-row to its left because there’s a black square between them. Down columns work the same way. Now solve!!
