Sudoku Handheld Electronic Game with Touch Screen Sudoku Handheld Electronic Game with Touch Screen General Features: Ergonomic Design Easy to hold Super large backlit screen (3.5-inch diagonal) Touch Pad with backlights There are 9 hints available in every game Reminder function for wrong answers Easy to play...hard to master! 3 difficulty settings 100,000 built in puzzle games Sound effect for exciting play (built-in speaker)