Play Sudoku

Pick a difficulty, fill the grid, solve the puzzle

Difficulty:
Time
00:00
Mistakes
0
Best Time (Easy): --:-- | Best Time (Medium): --:-- | Best Time (Hard): --:--

How to Play

Four steps from empty grid to solved puzzle

🎚️ Choose a Difficulty
Easy removes 35 cells (easier to solve), Medium removes 45 cells (moderate challenge), Hard removes 55 cells (requires advanced techniques). Choose based on your experience level.
⌨️ Fill Empty Cells
Click any empty cell to select it, then type a digit from 1 to 9. The game validates your input instantly — correct numbers stay, wrong ones flash red and add a mistake.
🧠 Follow the Rules
Every row must contain digits 1-9 with no repeats. Every column must contain digits 1-9 with no repeats. Every 3×3 box (marked by thick borders) must contain digits 1-9 with no repeats.
🏆 Solve the Puzzle
Fill every cell correctly to win. Your completion time and mistake count are recorded, and your fastest solve per difficulty is saved automatically for next time.

A Grid of Digits.
A Test of Pure Logic.

Sudoku first appeared in American puzzle magazines in the late 1970s under the name "Number Place," but it became a global phenomenon when Japanese publisher Nikoli started printing it in 1986. The name means "single digits" in Japanese — a perfect description of the game's elegant simplicity.

What makes Sudoku special is that it requires no advanced mathematics — only logic and deduction. You are not adding or multiplying; you are placing nine digits according to three simple constraints. The complexity emerges from those constraints interacting across 81 cells. Easy puzzles can be solved with simple elimination, while harder puzzles may require techniques like naked pairs, hidden singles, and X-wing patterns.

This version keeps the puzzle pure and adds three things: a spoken narrator who reacts to each move, a hint button for when the board stalls, and mistake tracking so you can measure improvement over time.

Real-time Validation
Wrong answers flash red immediately, helping you learn the rules and catch mistakes before they cascade.
Voice Commentary
A narrator cheers correct moves, consoles mistakes, and announces completion — mute it with one tap.
Smart Hints
Stuck? The hint button reveals one correct digit for a random empty cell. Each hint adds one mistake to your counter.
Best Time Tracking
Your fastest completion time per difficulty is saved in your browser. Beat it and the game announces a new record.

How This Version Stacks Up

Compared against other online Sudoku tools

FeatureThis GameOther Sudoku Tools
Live Voice Commentary
Smart Hints
Mistake Counter
Pause Function
No Ads or Login

Three Difficulty Levels

Same rules, fewer starting numbers — pick the challenge that matches your skill

Easy
35 Empty Cells
46 numbers given to start. Perfect for learning the rules and practicing basic elimination techniques.
Medium
45 Empty Cells
36 numbers given. Requires intermediate techniques like naked pairs and pointing pairs to solve efficiently.
Hard
55 Empty Cells
26 numbers given. Demands advanced techniques like X-wing, swordfish, and coloring to crack the toughest puzzles.

Winning Strategies

Scan for Singles
Look for rows, columns, or boxes where only one digit can fit in a specific cell. These "naked singles" are the easiest moves and often unlock the next chain of deductions.
Use Elimination
When you place a digit, immediately eliminate it from its row, column, and box. This cascading elimination often reveals the next move without additional scanning.
Look for Pairs
When two cells in a row, column, or box can only contain the same two digits, those digits are locked to those cells. This "naked pair" eliminates those digits from other cells in the same region.
Work Systematically
Solve one digit at a time across the entire board. Place all the 1s you can find, then all the 2s, and so on. This methodical approach often reveals patterns you'd miss jumping around randomly.

Perfect For

Students

Builds logical thinking, pattern recognition, and systematic problem-solving — skills that transfer to math and science.

Working Professionals

A focused mental break that exercises the same deductive reasoning used in debugging code or analyzing data.

Seniors

Gentle, self-paced cognitive exercise that researchers link to maintaining working memory and processing speed.

Families

Take turns solving the same puzzle on one device. Compare completion times and mistake counts — siblings get competitive fast.

Quick Breaks

Easy mode takes 5-10 minutes. Perfect between meetings, during loading screens, or as a focus reset between tasks.

Frequently Asked Questions

Real questions about this Sudoku implementation

Fill every row, column, and 3×3 box with digits 1 through 9, using each digit exactly once per region. Start with cells that have the fewest possibilities and use elimination to narrow down options. Look for "naked singles" (cells where only one digit can fit) and work systematically through the board.
Easy removes 35 cells, Medium removes 45, and Hard removes 55. The higher difficulties provide fewer starting clues and generally require more advanced solving techniques.
Yes, the hint button reveals the correct number for one random empty cell. Each hint adds one mistake to your counter, so use them sparingly to keep your score clean. Hints are unlimited but penalized to encourage learning.
The game uses your browser's built-in Web Speech API to speak commentary messages like "Great move!" or "Oops, try another number." No plugins required. Mute it anytime with the speaker button in the sidebar — the text commentary continues on screen.
Yes, your fastest completion time for each difficulty level is stored in your browser's local storage under separate keys. Clearing browser data resets these records. The data never leaves your device and is not shared with any server.
Yes, the 9×9 grid is fully responsive and touch-optimized. Tap an empty cell to select it, then enter a digit from 1 to 9 using your device keyboard. Voice commentary works on modern mobile browsers too.