GoodCube Sudoku 3x3 Magic Cube Stickerless 3x3x3 Number Speed Cube Puzzle
- No pencil or paper required. Made of beech wood, 81 thinking tiles. The best way to train brain. 2 spare tiles per number included..
- Comes with booklet of 100 sudoku puzzles.
- With 9 pieces spare chess. The best way to train brain..
- The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes.