Sudoku (?? s?doku, 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.

150 brain-teasing Sudoku puzzles
Random level generator
Level's progress save
Beautiful minimalist design, multiple color themes
10 ambient relaxing soundtracks
Achievements with Latin and Cyrillic characters
Trading Cards, Badge, Emoticons and Backgrounds (Coming soon)
Steam Cloud support