Sudoku generator
Fresh sudoku in 4 levels, every one with its answers. Print and play.
Sudoku Generator
Generates classic 9 x 9 sudoku in four levels and puts 1, 2, 4 or 6 of them on a printable page. Each puzzle is filled at random, then digits are taken away in pairs while a solver confirms there is still exactly one solution. A second page shows every answer, with the given digits in bold.
- A solver checks every puzzle and keeps it only if it has exactly one solution.
- Easy and Medium can be solved step by step without guessing. Hard and Expert give fewer digits.
- The given digits are placed in a symmetric pattern, as in printed puzzles.
Questions
How are the levels different?
Easy gives about 40 digits and Medium about 33, and both can be solved step by step without guessing. Hard gives about 28 and Expert about 26, and both are chosen so the simple steps alone are usually not enough.
Does every sudoku have one solution?
Yes. A solver tries every possibility and keeps the puzzle only if exactly one solution exists.
Can I use the puzzles in a book or a class?
Yes. The puzzles are made by the generator from your seed, and we claim no rights over them.
Is it free?
Yes. Making the puzzle and downloading the PDF are free, with no account and no pass.