Sudoku Quest

Sudoku is a classic logic puzzle played on a 9×9 grid. The goal is to place digits 1–9 so that each row, each column, and each 3×3 box contains every digit exactly once. It does not require arithmetic—only careful deduction—so it works well as a short mental workout for beginners and experienced players alike.

This tool turns Sudoku into a campaign-style experience with progressive levels, while still offering a free practice mode for unlimited play. Everything runs in the browser, so you can start immediately without installing an app.

Key Features

• Campaign mode: 50 levels from Easy to Expert. Clear a level to unlock the next; stars and progress are saved locally.
• Practice mode: Choose Easy, Medium, Hard, or Expert and generate as many puzzles as you like without affecting campaign progress.
• Notes mode: Mark candidate digits in empty cells to support step-by-step reasoning.
• Board check: Highlight incorrect entries so you can fix mistakes early.
• Coin hints: Find an error, reveal one cell, or show the full solution (sign-in and Coins required).

Who It Is For

• Students and professionals who want quick logic practice during breaks
• Casual players who enjoy level progression and star ratings
• Beginners who prefer a gentle difficulty curve
• Anyone who wants browser-based Sudoku with no download

How to Use

1. Open the page in Campaign mode and pick an unlocked level from the level grid.
2. Select a cell, then enter a digit with the on-screen keypad or keys 1–9. Use Erase or Delete to clear a cell.
3. Turn on Notes mode for candidates; use Check Board when you want to verify your progress.
4. If you get stuck, spend Coins on hints: find an error, reveal a cell, or show the full solution.
5. After clearing a level, earn 1–3 stars based on time and hint usage, then continue to the next level or switch to Practice mode.

Solving Tips

Start with cells that have only one possible candidate, then use row, column, and box elimination. Try to finish without hints when you can—this builds speed and confidence. Use the full solution only when you are truly stuck, since it limits that level to 1 star.

FAQ

Q: Will my campaign progress be saved?

A: Yes. Level unlock status and stars are stored in local browser storage on the same device and browser. Clearing site data will reset progress.

Q: What is the difference between Campaign and Practice?

A: Campaign progresses through levels with saved stars and unlocks. Practice lets you pick a difficulty and play unlimited puzzles without affecting campaign progress.

Q: How are stars calculated?

A: Stars depend on clear time and whether hints were used. Solving without hints and within the time target yields higher stars. Revealing the full solution caps the level at 1 star.

Q: How does Notes mode work?

A: With Notes mode on, tapping a digit marks or clears a candidate in an empty cell. It helps you reason step by step without committing a final answer.

Q: Can I play on mobile?

A: Yes. The layout adapts to phones and tablets, and you can play by tapping cells and number keys.