Create a fresh 9×9 Sudoku puzzle with a guaranteed unique solution. Choose a difficulty, print the grid for your class or solve it on screen, then reveal the answer whenever you want to check.
All processing runs locally in your browser. Your data is not uploaded to any server.
100% Local
How to Use the Sudoku Generator
Pick a difficulty and press Generate Puzzle. Every puzzle is built from a complete grid and then reduced so that exactly one solution remains, so the puzzle you print is always solvable by logic.
Choosing the difficulty
Easy keeps around 40 given numbers for younger or newer solvers.
Medium leaves about 32 givens as a steady daily challenge.
Hard trims the givens further for experienced players.
Tick Show the solution to fill in the answer cells, highlighted in blue.
Features
9×9 puzzles with rows, columns and 3×3 boxes following the classic rules
Every puzzle verified to have exactly one solution
Three difficulty levels and a printable grid
Optional solution overlay for quick marking
Copy the grid as text or use the Print button
All processing runs locally in your browser. Your data is not uploaded to any server.
Sudoku builds logical reasoning and patience. Print a fresh grid for each student so everyone solves a different puzzle.