Sudoku Puzzle Book Volume 4: 200 Puzzles, Book of Hard Sudoku: Challenge for eve
19,61 €
For example, in a 9x9 grid, it is the aim to put the number 1 to 9 in each of vertical and horizontal lines. This place 9x9 divided into nine squares of 3x3 in nine rows and nine columns, for a total of 81 small squares.
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