A fun hobby that exercises your brain and gives you a sense of accomplishment. That's the perfect description of the numbers puzzle from Japan called sudoku.
* Sudoku 4x4. 200+ hard sudoku puzzles with solutions:
* Large print hard Sudoku puzzles.Suitable for seniors and Kids
* Sudoku grids are large, very easy to read, and fill out
* 4 Puzzles Per Page, solving could be easy on your eyes
If you'd like to boost the performance...