This book has 100 Hard Sudoku 16 X 16 Puzzles. Challenge yourself today with Sudoku Hard Level Puzzles! Each row, column and 4 x 4 box must contain one of the characters 1 to 9 or A to G. This is the first volume of 2019 16 X 16 Hard Sudoku Puzzle Books For Adults. Answers are also included.
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