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The standard form of this Latin square puzzle consists of a grid divided into a number of heavily outlined regions, each of which contains a small clue number and a mathematical operation. The grid is to be filled in with the numbers from 1 to N, not repeating a number within a row or column, such that the result of applying the operation in each region to the numbers filled into that region equals the clue number. IN some variants the operations may be omitted and only the numbers given.
Also called: calcudoku
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