Online Sudoku Generator - Create Random Sudoku

Online Sudoku Generator – Create Random Sudoku

Sudoku Settings

Difficulty ★★★☆☆☆

Game Options

Real-time Error Highlighting Auto-erase Notes on Number Input

Sudoku Board (Normal Difficulty)

My Records

Total Clears

Very Easy

Best: –

Easy

Best: –

Normal

Best: –

Hard

Best: –

Very Hard

Best: –

Expert

Best: –

Sudoku Game Tips & Strategies

Basic Rules: Each row, column, and 3×3 box must contain numbers 1-9 exactly once

Note Feature: Switch to note mode to mark possible numbers in small text

Scanning Technique: Find missing numbers in each row, column, and box to narrow down possibilities

Elimination Technique: Eliminate existing numbers to gradually find possible values

Unique Candidate: Look for positions where only one number can fit

Logical Reasoning: Find definite answers through logical analysis rather than guessing

Usage: Select difficulty and click ‘Generate New Sudoku’ | Features: Hint, error check, solution view, note mode, progress display, timer | Print Tip: Download and save as PNG image to print

The online Sudoku generator is a free web tool that creates infinitely new Sudoku puzzles with just one click. It offers 6 difficulty levels for users of all skill levels from beginners to experts, and features various convenient functions such as note-taking, hints, and error checking.

Key Features

1. 6-Level Difficulty System

Very Easy: 30 empty cells – Perfect for beginners new to Sudoku
Easy: 40 empty cells – For beginners learning the basic rules
Normal: 50 empty cells – The most popular level with standard difficulty
Hard: 58 empty cells – For intermediate players requiring logical reasoning
Very Hard: 64 empty cells – For advanced players requiring advanced strategies
Expert: 70 empty cells – The most challenging puzzles at the highest difficulty

2. Note Feature

You can switch between normal mode and note mode. In note mode, you can mark up to 3 possible numbers in small text per cell, which is very useful when solving complex puzzles. You can choose whether to automatically erase notes when entering numbers or keep them.

3. Timer and Record Management

The timer starts automatically when the game begins, and you can pause and resume it as needed. Clear counts and best times for each difficulty level are automatically saved, allowing you to track your skill improvement.

4. Game Assistance Features

Hints: 3 hints provided to use when stuck
Error Check: Finds incorrect numbers among currently entered values
Show Solution: Ability to view and hide the correct answer
Real-time Error Highlighting: Immediately displays incorrect numbers in red
Progress Display: Shows completion percentage

5. Download and Print

Generated Sudoku puzzles can be downloaded as PNG image files. You can print them to solve offline or share with friends.

How to Use

Select Difficulty: Choose a difficulty level that matches your skill.
Generate Sudoku: Click the ‘Generate New Sudoku’ button to create a puzzle.
Solve Puzzle: Click on empty cells and press number buttons to enter values.
Use Notes: For complex cases, switch to note mode to mark possible numbers.
Completion: When all cells are correctly filled, completion is automatically recognized.

Keyboard Shortcuts

Number Keys 1-9: Enter numbers in the selected cell
Delete or Backspace: Clear the contents of the selected cell

Sudoku Solving Strategies

Basic Rules

Sudoku is a puzzle where you fill a 9×9 grid with numbers 1 through 9. Each row, column, and 3×3 box must contain the numbers 1 through 9 exactly once without repetition.

Tips for Beginners

Scanning Technique: Look through each row, column, and box in order to find missing numbers.
Unique Candidate: Find cases where only one number can go in a specific cell.
Elimination Method: Narrow down possible numbers by excluding already used ones.

Tips for Intermediate Players

Hidden Singles: Find cases where a specific number can only go in one place within a row, column, or box.
Using Notes: Mark possible numbers in each cell to identify patterns.
Logical Reasoning: Find definite answers through logical analysis rather than guessing.

Benefits of Sudoku

Brain Training: Improves logical thinking and concentration.
Stress Relief: Helps forget daily stress while solving puzzles.
Time Utilization: Can be enjoyed in short periods, making efficient use of spare time.
Sense of Achievement: Experience satisfaction when completing puzzles.
All Ages: Can be enjoyed by everyone from children to seniors.

Frequently Asked Questions

Q. I’m new to Sudoku. Which difficulty should I start with?

A. We recommend starting with ‘Very Easy’ or ‘Easy’ difficulty. Once you’re familiar with the basic rules, gradually increase the difficulty.

Q. Does using hints affect my records?

A. Completion time and count are recorded regardless of hint usage. Feel free to use them for learning purposes.

Q. Do generated Sudoku puzzles always have a unique solution?

A. Yes, all generated Sudoku puzzles are designed to have only one unique correct answer.

Q. How are records saved?

A. Records are saved in the browser’s local storage, so they persist when accessing from the same browser.

Q. Can it be used on mobile devices?

A. Yes, it’s built with responsive design and works smoothly on smartphones and tablets.

Start Now

Challenge yourself with new puzzles anytime, anywhere with the free online Sudoku generator. You can enjoy it right in your browser without registration or installation, manage your records, and improve your skills. Easy for beginners to start, with difficulty levels that satisfy even experts.