Sudoku by Nestor Yavorskyy

Sudoku (数独 sūdoku, digit-single) - is a logic-based, combinatorial number-placement puzzle. 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", "blocks", or "regions") contains all of the digits from 1 to 9. 100 brain-teasing Sudoku puzzles beautiful minimalist design, more than 10 color themes 10 ambient relaxing soundtracks 500 achievements 15 Trading Cards, Badge, Emoticons and Backgrounds (Coming soon) Cross-platform saves via Steam Cloud Windows, Mac & Linux Free DLCs with community-generated achievements