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Test your IQ with Toy Cubby Brain Challenge Sudoku Number Cube Puzzle, a collaboration of cube puzzle and sudoku, a new and exciting way to test your brain in solving puzzles. Made of high quality material, doesn't break or disassemble easily when fall, easy to twist and turn. Cube measures 2¼ x 2¼ x 2¼ inches, fits well inside your backpack, great for people who loves new and hard challenges, helps overcome boredom anywhere and anytime. Serve as a gift, desktop or divider cabinet decoration and a must included puzzle in your puzzle collection.