With its 9 x 9 grid, this number puzzle presents the greatest challenge after the Rubik's Cube. The empty cells must be filled so that the numbers from 1 to 9 appear only once in each row, each column, and each 3 x 3 block.

And the best part is that you don't need to be a number enthusiast or mathematician to be captivated by Sudoku. There are 5 levels of difficulty. This unit of sale consists of 5 identical titles.