qqwing

Sudoku solver and generator

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.