Features: 1) Sudoku is the addictive number puzzle game that has taken the UK by stormandis now taking over the rest of the world. It is branded by many as the hottest puzzle since the Rubiks Cube. Studies show that playing Sudoku can improve memory, mind clarity, and even stop and prevent brain illnesses such as Alzheimer 2) Therefore there are some scientists and researchers recommending playing Sudoku,as port of our regular daily activity Specifications: 1) Display: LCD screen, 77x 53mm 2) Game function: a) 5 levels of game play b) Revise selection function 3) Function keys: a) Mode / pause key b) Start / solve key c) Up / down / left / right key d) On / off key e) Sound key f) 1 to 9 number pad 4) Other functions: a) Time / date display b) Alarm function 5) Power supply: 2 x AAA alkaline batteries (not included) 6) Rules: fills in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9, and there is no any repeat number for each row and column Inner packing: Color box Outer packing: 60pcs/ctn Carton dimensions: 65 x 35.6 x 40cm N.W.: 11kg G.W.: 13kg Conveyance: Qty/20\'\' FCL: 18,200pcs