*sudoku: 500 Sudoku Puzzles*(Easy, Medium, Hard, VeryHard)(SudokuPuzzleBook)Vol.
30,92 €
SUDOKU basics: SUDOKU PUZZLE are made up of rows columns and boxes which all contain nine cells and contain the numbers 1 to 9 only used once. There have been a number of works in recent years that have focused on solving hard Sudoku puzzles.
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