Sudoku generates puzzles with 3 difficulty levels (Easy, Medium and Hard) depending on Sudoku strategies needed to solve it. Generated puzzles are always with one solution. In every moment you can reset it or check whether all digit are correct (compared with the solution). You can enter your own Sudoku - Sudoku Free will solve it and will tell you whether it is solvable and whether there is a one solution or more. There are many options that you can specify: - highlight cell if you ins