Multi-Player SudokuCompete with your friends and beat their scores with the Multi-Player Sudoku Electronic Handheld! With 999 programmed puzzles, three levels of difficulty, and an adjustable LCD screen, this game is clearly a cut above the rest.Even has a timer to track how long you take on each puzzle.Endless supply of random and unique puzzles 3 levels of play: easy, medium and hard Alert sound for incorrect input Requires 1.5 volt and 2 AA batteries (not included)WARNING: Choking Hazard- Small Parts. Not for children under 3 years.