How do I correctly solve an Ultimate Sudoku puzzle?

The goal is to fill the 9x9 grid so that every row, every column, and every 3x3 subgrid contains all of the digits from 1 to 9 exactly once. Use logic to deduce the correct placement.

Is Ultimate Sudoku HTML5 free to play online?

Yes, Ultimate Sudoku HTML5 is completely free to play. You can enjoy unlimited puzzles and challenges with no payment or hidden costs required.

Can I play Ultimate Sudoku on my phone or tablet?

Absolutely. This HTML5 version is fully optimized for touch controls, allowing you to play seamlessly on Android, iOS, and desktop browsers.

Do I need to download Ultimate Sudoku to start playing?

No download needed! Ultimate Sudoku is a browser game, meaning you can open the URL and start playing instantly without any installation required.

What are the best strategies for solving hard Sudoku puzzles?

Focus on areas with the fewest empty cells first. Use "pencil marks" (notes) to track potential numbers in a cell, and look for "naked singles" or "hidden singles" to eliminate possibilities.

Ultimate Sudoku HTML5

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Ultimate Sudoku HTML5

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Ultimate Sudoku HTML5

ultimate-sudoku-html5

Ultimate Sudoku HTML5 brings the addictive, classic Japanese number puzzle directly to your browser. Your mission is to master the 9x9 grid by using pure logic to place digits 1 through 9 without repetition. Challenge your mind and enjoy hours of brain-training fun!

In the new Ultimate Sudoku HTML5 online game, we bring to your attention a Japanese Sudoku puzzle. In front of you on the screen you will see a square, which consists of cells 9 * 9. In some of them, the entered numbers will be visible. Your task is to fill all the squares with numbers. The basic rule of filling is simple: in each column and line, each number from 1 to 9 must occur only 1 time. As soon as you correctly fill in all the cells, you will be given points in the Ultimate Sudoku HTML5 game and you will move on to solving the next Sudoku.

puzzle casual

182Votes

5-15Minutes

SudokuCategory

How to Play

1Select a difficulty level (Easy, Medium, Hard) to begin a new puzzle.
2Tap or click an empty cell on the 9x9 grid where you wish to place a number.
3Click the number pad (1-9) to input your chosen digit into the selected cell.
4Ensure that each number appears only once in its corresponding row, column, and 3x3 block.
5Complete the grid correctly without errors to successfully solve the puzzle and advance to the next level.

Frequently Asked Questions

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Game Controls

Tap or click an empty cell to select it.

Click the number on the pad (1-9) to fill the selected cell.

Use the undo button to correct mistakes or clear a cell.

Switch to Note Mode to jot down potential numbers in a cell.

Game Features

🧠 Boost Your Logic Skills:Sharpen your focus and improve critical thinking with thousands of challenging 9x9 grids.
📱 Play Anywhere, Anytime:Enjoy the full Sudoku experience optimized for seamless play on mobile, tablet, or desktop browsers.
🏆 Multiple Difficulty Levels:Choose from Easy, Medium, Hard, and Expert modes to match your expertise and test your limits.
⚡ Instant Browser Access:Jump into the game immediately. No registration, no downloads, just classic Sudoku fun.