Among the most popular are Sudoku and crossword puzzles—two seemingly different ... Sudoku is a logic-based number puzzle ...

The objective of Sudoku is to fill in the missing numbers in a 9x9 grid so that each row, column, and 3x3 section boxes contain all digits between 1 to 9 without repetition. One needs to apply ...

The incredibly popular logic puzzles are a great way to kill a few ... one through nine into every one of the 81 squares in our 9x9 Sudoku grid and seeing which combinations are valid solutions ...