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The Mini Book of Logic Puzzles - Sudoku X 200 Hard (Volume 10)
Paperback
$8.99
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Sudoku X also called Diagonal Sudoku. Each puzzle consists of a 9x9 grid containing given clues in various places. The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column, diagonal and 3x3 box.
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