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.

• 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
  
• Steam Cloud support