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Fill in each square in this grid with a digit from 1 to 9. The sum of the digits in each row or column will equal the little number given just to the left of or above that row or column. You can’t repeat any digits in a row or column. See the four-box row in the upper-left of the grid with 28 to the left of it? That means the sum of the digits in those four squares will be 28. A row or column ends at a black square, so the four-square row in the upper-right with a 27 to its left may or may not have digits in common with the 28-row next to it; they’re considered different rows because they’re separated by a black square. Down columns work the same way. It’s psychotic!
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