Key Features:
- Color cells and candidates
- Draw lines and chains to trace the logic behind advanced solving techniques
- Enter your own puzzles or generate new ones at random
- 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