Containing 1 million puzzles with 4 difficulty levels and a backlight for improved visibility. You can even input the sudoku from your daily paper and solve it at your leisure! Also features save and recall, hint and clue functions, plus a built in timer for the ultimate challenge. Blue and white. Requires 2 x AAA batteries (not included). Size (H)20, (W)13, (D)4.5cm. For ages 3 years and over.