Sharpen your mind,
one cell at a time.
Sudokuh is a fast, beautiful, and open-source Sudoku experience. Choose your grid size, set your difficulty, and race the clock.
Everything a great Sudoku needs
No subscriptions. No ads. Just pure, distraction-free puzzle logic.
Two Grid Sizes
Ease in with a 6×6 board or tackle the classic 9×9 — both beautifully rendered.
Five Difficulty Levels
From Easy to Crazy. Each level unlocks a higher score multiplier for the leaderboard.
Global Leaderboard
Submit your time and compete with puzzle solvers from around the world.
Smart Hints
Stuck? Get a nudge on any cell without spoiling the whole puzzle.
Timed Scoring
Every second counts. Solve faster and score higher — no account required.
Instant Validation
Hit Check anytime to catch mistakes early and sharpen your logic.
Up and playing in 30 seconds
Pick a mode & difficulty
Choose 6×6 or 9×9, then dial in Easy through Crazy.
Click a cell, enter a number
Use your keyboard or the number pad. Conflicts light up instantly.
Finish the grid
Every row, column, and box must contain each digit exactly once.
Submit your score
Win? Enter your name and country to claim your spot on the leaderboard.
Ready to challenge yourself?
Pick a difficulty, fill the grid, and chase the top of the leaderboard. No sign-up. No limits.