Work through 100 classic Sudoku puzzles, ranging in difficulty from Easy to Master. Draw freely on the board to visualize your reasoning as you solve, and enjoy the game entirely offline with no ads or in-app purchases.

Key Features:

• Color cells and candidates
  
• Draw lines and chains to trace the logic behind advanced solving techniques
  
• Automatically save your progress and resume whenever you like
  
• Auto candidates (optional): initially fill in candidates for every empty cell based on the given numbers, then automatically eliminate them as you enter numbers
  
• Highlight numbers
  
• Conflict detection: automatically flag duplicate numbers in the same row, column, or box
  
• Five checks per puzzle to verify whether a number you've entered is correct
  
• Undo and redo your moves
  
• Play with mouse or keyboard