Play Sudoku

Sudoku is a logic-based puzzle game played on a 9x9 grid, some of whose cells are pre-filled with numbers. The objective of the game is to fill in the remaining empty cells with a single-digit number (1 through 9) in such a way that every row, column, and 3x3 sub-grid contains each of the digits from 1 to 9 exactly once. Although numbers are used in the game, there is no arithmetic involved. Completing a Sudoku puzzle requires the use of logic and working memory, which is the ability to hold information in your mind over brief intervals.