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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 it. You can’t repeat any digits in a row or column. See the three-box row in the upper-right of the grid with an 8 to the left of it? That means the sum of the digits in those three squares will be 8, and none of the digits will be the same. A row or column ends at a black square, so the two-square row in the upper-center with a 13 to its left may or may not have digits in common with the 8-row to its right; 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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