Sudoku Puzzle Cube - A Fun Portable Take on the Classic Sudoku Game - Can You Solve All 6 Sides? This puzzle cube combines the challenge of Sudoku with the difficulty of a puzzle cube. Try to fill each side of the puzzle cube with the digits 1 through 9 without repeating numbers. Great for fans of the popular Sudoku number game. Featured in a 3 by 3 grid, each side measures approximately 3 inches. Recommended for ages over 5.