Sudo-Q-Mate Pro - One Million Sudoku Puzzles Handheld Game - As Seen On TV Features include fun and challenging, requires no math skills needed, includes over 1 million puzzles Easy to Use Number KeypadIncludes Game Timer, Track Your Speed While You PlayNew State-of-the-Art LCD Memo Function Large display Screen9 skill levels from beginner to expert For ages 9 to 99, measures 4.5" x 3.375" x 1" Requires 2 AAA batteries, not included