About the game
Sudoku Online is classic sudoku in your browser. Fill the 9×9 grid with digits 1 to 9 so that each digit appears once in every row, column and 3×3 box.
Choose from Easy, Medium, Hard and Expert, plus extra game modes.
How to play
- 1The goal is to fill a 9×9 grid with digits from 1 to 9 so that each digit appears exactly once in every row, column, and 3×3 box.
- 2Some cells are pre-filled — these are your starting clues.
- 3Begin with cells that have the most filled neighbors: fewer options make it easier to identify the correct digit.
- 4As cells are filled in, the choices for adjacent ones narrow down — the puzzle unfolds as a chain of logical steps.
- 5Use the notes mode to write down multiple candidates in a cell and eliminate them as the grid fills up.
- 6This is especially useful at Hard and Expert levels.
Tips
- Start with rows, columns or boxes that are nearly full.
- Use notes to track possible digits.
- If a digit can only go in one place in a box, place it.
From the developer
Sudoku Puzzle is a free online Sudoku game. No registration, play instantly in your browser. The classic mode offers four difficulty levels: Easy for beginners, Medium for steady practice, Hard for experienced players, and Expert for those who seek a real challenge. Additional game modes expand the standard rules: X-Sudoku adds diagonal constraints, Windoku introduces extra regions on the grid, Killer Sudoku requires groups of cells to meet a target sum, and Kropki adds ratio and difference markers between adjacent cells. Every puzzle has exactly one solution, reachable through pure logic — no guessing required. If you get stuck, a step was missed somewhere, and it can always be traced back. Sudoku Puzzle is also a competitive experience. Leaderboards track rankings by level, score, and wins. Personal profiles store game history and detailed statistics. The chat lets players connect, share strategies, and challenge each other.
FAQ
Is Sudoku Online free to play?
Yes. Sudoku Online is free on EarnVera, with no download and no account. The site is supported by ads.
Do I need to download or install anything?
No. It runs in your web browser on phones, tablets and computers.
Will my progress save?
Most games save progress in your browser on this device. Clearing your browser data resets it.
