Sudoku

Sudoku is a "logic-based number placement puzzle" game. The object of the game is to fill a 9x9 grid with digits so that each column, row, and 3×3 sub-grid contains all of the digits from 1 to 9. How to play: Start by selecting a puzzle. There are four difficulty levels. There are 125 puzzles per difficulty level. Select an empty cell on the game grid.