If you like Sudoku, you'll love Sudoku Cube! It features billions of combinations - with only one solution. Solve 18 different Sudoku puzzles simultaneously on the cube. There are six vertical across three sides (3 + 3 + 3), six horizontal across three sides and six regional - one on each side. Includes Sudoku cube and instruction booklet, solve and history of Sudoku. Also includes 50 new 2-D Sudoku puzzles. Measures 5.7cm x 5.7cm x 5.7cm .