Features: 1.Sudoku,Sudoku Game 2.Large LCD screen display 3.Over 10,000 puzzles built-in 4.Three levels: ... easy/hard/advance Features:1.Sudoku,Sudoku Game 2.Large LCD screen display 3.Over 10,000 puzzles built-in 4.Three ... :easy/hard/advance 5.Direct number pad input 6. Clock display 7.Power,Hints,Submit,Mute,Start/Pause,Cancel Key 8.Fill ...