The Touch Sudoku Electronic Puzzle Generator from Excalibur Electronics offers you 999 specially selected puzzles for Sudoku whenever and wherever! This handheld puzzle game features three levels of difficulty so you can increase the challenge as you learn the game. Innovative technology allows you to save and retrieve up to 3 separate games, while a save mode has your back in the event of dead batteries or quick getaways! Ergonomically designed, this electronic puzzle game includes a stylus for easier play while the intuitive touch screen control ensures accuracy. Theres even a hint key in case you get stumped. The Touch Sudoku Electronic Game requires 2 AAA batteries (not included).