Sudoku is a classic puzzle game that has been around for a long time. Sudoku's purpose is to complete a 9x9 grid with numbers such that each row, column, and 33 segment include all digits from 1 to 9. Sudoku is a great brain game since it is a logic problem. If you play Sudoku on a regular basis, you will notice an increase in your focus and total brain function. Now is the time to begin a game. Sudoku free puzzles will quickly become your favorite online game.