Free Generator & Printables
Make a puzzle, play or print
Every puzzle is freshly generated with exactly one solution, so it is always fair. Pick a difficulty, switch between shapes and numbers, then play it online or print it for pen and paper.
Easy - 0 clues - one unique solution.
Printable Sudoku, on demand
Tap New puzzle as many times as you like and print each one for free. Every board is unique and guaranteed solvable by logic alone, with no guessing required. Switch to Numbers if you prefer a classic printout, or keep the Shapes for the full Shapedoku look.
How the generator works
First it builds a complete, valid solution by filling the grid with a randomized backtracking search. Then it removes clues one at a time, and after every removal it checks that the puzzle still has exactly one solution. It stops when it reaches the clue count for your chosen difficulty, so the result is always fair, never ambiguous.
Stuck on a puzzle?
Press Show answer to reveal the full solution, or drop your clues into the Sudoku solver to solve it step by step. New to the game? Start with our beginner guide.