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Sudoku

Fill each row, column, and 3x3 box with numbers 1-9 without repeating. Use logic and deduction to solve the puzzle.

00:000 mistakes0 hints

Tap a cell to select • Use number pad below

Step 1: The Empty Grid
Sudoku is played on a 9x9 grid divided into nine 3x3 boxes. Each cell will contain a number from 1 to 9.

The 9x9 grid is divided into nine 3x3 boxes. Every cell will contain a number from 1 to 9.

How to Play Sudoku
Sudoku is a logic-based number placement puzzle that exercises your brain and improves concentration.

Game Rules

  • Fill the 9x9 grid so each row contains all digits from 1 to 9
  • Each column must also contain all digits from 1 to 9
  • Each 3x3 box must contain all digits from 1 to 9
  • No number can repeat in any row, column, or 3x3 box
  • Use logic and deduction - no guessing required!

Controls

  • Click/Tap: Select a cell to fill in
  • Number Keys (1-9): Enter a number in the selected cell
  • Arrow Keys: Navigate between cells
  • Delete/Backspace: Clear the selected cell
  • N Key: Toggle notes mode on/off
  • Ctrl+Z: Undo last action

Features

  • Notes Mode: Add small candidate numbers to cells when uncertain
  • Hints: Reveal the correct number for the selected cell
  • Undo: Go back and fix mistakes
  • Auto-Highlight: See related cells and matching numbers
  • Timer: Track your solving time
  • Mistake Counter: See how many errors you've made

Difficulty Levels

  • Easy: Great for beginners, more given numbers
  • Medium: Balanced challenge for regular players
  • Hard: Requires advanced techniques
  • Expert: Maximum challenge, fewest given numbers

Strategy Tips

  • Scan rows and columns: Look for missing numbers
  • Focus on boxes: Find cells where only one number fits
  • Use notes: Mark possible candidates to track options
  • Elimination: Remove impossible candidates systematically
  • Look for singles: Find cells or groups with only one option
Logic Strategy Classic
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