digital sudoku game pen This pen has digital Sudoku game puzzles. To play Sudoku, fill the game grid so that every row, every column, and every 3x2 box contains the numbers 1 through 6. This digital Sudoku game has over 10,000 6x6 mini puzzles, automatic timer, and two levels of play (easy or hard). Has an on/off button, so the Sudoku puzzle can be turned off during play and the same Sudoku puzzle will resume when turned back on. Has a button to turn the sound on or off. The digital game keeps the top three high scores. Has a reset button on the back. The batteries are included and already installed. The ballpoint pen is retractable and has black ink.