Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9 9 grid with digits so that each column, each row, and each of the nine 3 3 sub-grids that compose the grid contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
This sudoku puzzle book contains normal to hard levels of difficulty and suitable for seniors. Find some puzzles to hard? Answers are provided at the end of the book, so do not worry
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