Sudoku is a logic-based number puzzle played on a 9x9 grid. The objective is to fill in the grid so that each row, column, and 3x3 box contains the numbers 1 to 9, without repeating any numbers.

Enjoy! Sudoku is a cross-number crossword that will definitely challenge your brain as well as your patience. (Level of Difficulty on a scale of 1-5: Monday and Tuesday, 1; Wednesday and Saturday ...

Since there are 9 possibilities for each of our 81 squares ... through nine and relabel our squares to get the total number of valid Sudoku grids. (That number of ways to permute the top right ...