With the 9 x 9 grid, this number puzzle offers the greatest challenge of the Rubik's Cube. The empty spaces 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: you don't need to be a number enthusiast or a math whiz to love Sudoku. It is available in 5 difficulty levels.

The unit sale includes 5 identical titles.