Sudoku～Relax number puzzle～

This is a sudoku of calm sound and design.

Sudoku, also known Number Place, is the most popular logic based number-placement puzzle in the world.

Sudoku is a brain training activity.

Please relax and work hard every day in the “Relax Sudoku”.

Fill the 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids contains all of the digits from 1 to 9 now!

You can play all for free.