Sudoku Posted/Updated on September 17, 2010 by Srinivasa Rao M Play Sudoku Puzzle Game Online Name of the Game: Sudoku Category: Puzzle Games Instructions: To enter a number click on the square where you want to insert it and type in using the keyboard. If you want to add additional numbers as pencil notes then click on options and tick the pencil marking box. The options also allow you to set the timer and help options. Difficulty settings are set at the top of the page. Good luck!