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Puzzles for Brain - Sudoku X 200 Hard Puzzles 16x16 vol.23
Each puzzle consists of a 16x16 grid containing given clues in various places. The object is to fill all empty squares so that the numbers 1 to 16 appear exactly once in each row, column, diagonal and 4x4 box.
116 pages, Paperback
Published April 22, 2019
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