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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 just above it. See the two-box row in the upper-center of the grid with 14 to the left of it? The sum of the digits in those two squares will be 14, and they won’t be the same number (i.e., two 7s). A row or column ends at a black square, so the two-square row in the upper-right with a 10 to its left of it may or may not have digits in common with the 14-row to its left; they’re considered different rows because they’re separated by a black square. Down columns work the same way. It’s psychotic!
