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Kakuro

Psycho Sudoku!
By PSYCHO SUDOKU  |  July 26, 2006

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All right, junior, this week I’m introducing you to an evil cousin of Sudoku called “Kakuro.” In a Kakuro, the little number to the left or top of each row or column tells you the sum of its digits. You can’t repeat any numbers in a row or column, and you can only use the numbers 1–9. See the row of three boxes at the top left with a 20 to the left of it? The sum of the numbers in those three boxes will be 20, and none of the three numbers will be the same. A row or column ends at a black square, so the four-square row in the upper-right corner with a 14 to the left of it may or may not have digits in common with that first row with the 20 next to it. Down columns work the same way: the two-square column with a 16 in the upper-right part of the grid uses a 7 and a 9, since they can’t both be 8 (that would repeat digits within the same column). Which box has the 7 and which the 9? That’s up to you to figure out. Don’t disappoint me here like you did last week. SOLVE!

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