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๐Ÿ”ข Sudoku ๐Ÿ”ข

Classic 9ร—9 Sudoku with four difficulty levels โ€” Easy, Medium, Hard, and Expert. Features a live timer, mistake counter, pencil notes, and 3 hints per puzzle. Beat your best time!

GamePuzzleMathNumber Sense3rd Grade
๐Ÿ”ข Sudoku ๐Ÿ”ข - Classic 9ร—9 Sudoku with four difficulty levels โ€” Easy, Medium, Hard, and Expert.

How To Use

Select a difficulty and click 'New Game'. Click a cell to select it, then click a number (or press 1โ€“9 on your keyboard) to fill it in. Wrong entries are highlighted in red. Use Notes mode (๐Ÿ“) to pencil in candidate digits. Use a Hint (๐Ÿ’ก) to reveal a cell when you're stuck. Finish all 81 cells correctly to solve the puzzle!

Key Features

  • Classic 9ร—9 Sudoku grid with proper 3ร—3 box constraints

  • Four difficulty levels: Easy (~51 clues), Medium (~41), Hard (~35), Expert (~29)

  • Live timer to track your solving speed

  • Mistake counter that highlights wrong entries in red

  • Pencil notes mode to mark candidate digits in cells

  • 3 hints per puzzle โ€” reveal a random cell's correct value

  • Auto-clear notes when a number is placed in a row, column, or box

  • Keyboard support: numbers 1โ€“9, Backspace to erase, N for notes, arrow keys to navigate

  • Best time leaderboard per difficulty saved in your browser

  • Procedurally generated puzzles using backtracking with MRV uniqueness guarantee

What Is This?

Sudoku is a classic logic-based number placement puzzle. The goal is to fill a 9ร—9 grid so that every row, every column, and every 3ร—3 box contains the digits 1 through 9 exactly once. No math required โ€” just pure deductive reasoning!

Why Use This?

Sudoku is one of the world's most popular brain-training games. Regularly solving Sudoku puzzles improves logical thinking, concentration, and short-term memory. Our generator creates fresh puzzles every time, so you'll never run out of challenges.

Frequently Asked Questions

How is the puzzle difficulty determined?

Difficulty is controlled by how many starting clues are given. Easy puzzles have ~51 clues (fewest empty cells), while Expert puzzles have only ~29 clues, requiring advanced logical deduction.

Are the puzzles guaranteed to have a unique solution?

Yes โ€” Easy, Medium, and Hard puzzles are generated with a uniqueness check. Expert puzzles also use uniqueness checking for the first 45 removals, making them virtually always unique.

What does Notes mode do?

Notes mode lets you place small 'pencil marks' inside a cell to keep track of possible digits. Notes are automatically cleared from a cell's row, column, and box when you place the correct number.

How do hints work?

You get 3 hints per puzzle. Each hint reveals the correct value for a random empty or incorrectly filled cell. Use them wisely on Expert puzzles!

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