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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 or above it. See the two-box row in the upper left with a 10 to the left of it? The sum of the digits in those two squares will be 10, and neither of the digits will be the same (i.e., there won’t be two fives). A row or column ends at a black square, so the three-square row in the upper-middle with a 17 to the left of it may or may not have digits in common with the 10-row to its left; they’re considered different rows because they’re separated by a black square. It’s kinda psychotic!