QQwing is a Sudoku puzzle generator and solver. It offers the following features.
- Fast. It can solve 1000 puzzles in 1 second and generate 1000 puzzles in 25 seconds.
- Uses logic. Uses as many solve techniques as possible when solving puzzles rather than guessing.
- Rates puzzles. Most generators don't give an indication of the difficulty of a Sudoku puzzle. QQwing does.
- Can print solve instructions. Tells steps that need to be taken to solve any puzzle.
- Customizable output style. Including a CSV style that is easy to import into a database.