I'll bet more people would have watched the Olympics if there was more of this too. Some times I think people only watch figure skating because they think they might get to see somebody lose a finger.
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Fill empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result shown in the top-left corner of the block. Play now!