Free Online Sudoku: Challenge Your Logic Daily
💡 Game not loading? Try clearing your browser cache (Ctrl+Shift+R) or use incognito mode.
Free Online Sudoku Game – CodeByArt Sudoku
Play free Sudoku puzzles online with multiple difficulty levels – Easy, Medium, Hard & Expert. Features include pencil notes, hints, undo, mistake tracking, and auto-save. Train your brain with this beautiful, mobile-friendly Sudoku game. No download required!
Train your brain
Loading game…
Free Online Sudoku: Challenge Your Logic Daily
Sudoku has remained one of the most popular logic puzzles in the world for a reason. It is a simple yet powerful way to sharpen your mind, improve concentration, and take a productive break from a busy day. At CodeByArt, we have designed a free, browser-based Sudoku game that lets you jump straight into the game without any downloads, sign-ups, or distractions.
Table of Contents
A Clean, Distraction-Free Experience
When you are solving a complex puzzle, focus is everything. This version of Sudoku is built with a minimalist interface that puts the grid front and center. Whether you are playing on a desktop computer during a lunch break or on a smartphone while commuting, the responsive design ensures the board is always easy to read and interact with.
The game caters to all skill levels. Beginners can start with the "Easy" mode to learn the ropes, while seasoned players can test their limits with "Medium," "Hard," and "Expert" settings. To help you solve difficult grids, we have included essential tools like a "Pencil Notes" mode for tracking candidates, an "Undo" button to correct mistakes, and a hint system if you find yourself stuck.
How to Play Sudoku
If you are new to the game, the rules are straightforward. The objective is to fill a 9x9 grid with numbers so that each column, each row, and each of the nine 3x3 sub-grids contain all of the digits from 1 to 9.
There is only one rule you must follow: no repeats. Each number can appear only once in its respective row, column, or box.
To solve the puzzle, use logic rather than guessing. Look for rows or squares that are nearly full, as these are usually the easiest to complete. If you are unsure about a number, use the notes feature to write down possibilities. This helps you visualize patterns and eliminate incorrect options through the process of elimination.
Frequently Asked Questions
Is the game truly random?
Yes. To ensure every game feels fresh, the puzzle generator starts by randomizing the three diagonal 3x3 sections first. Since these sections are mathematically independent of each other, filling them randomly creates a unique foundation for every new game.
How do you ensure the puzzles are solvable?
We use a method called the Recursive Backtracking Algorithm. This is a logic-based strategy that maps out a valid solution before the game even begins. When you select a difficulty level, the system uses a reduction strategy to remove specific numbers while verifying that the puzzle remains solvable. This guarantees that every board has a logical solution.
Will I lose my progress if I close the tab?
No. We understand that interruptions happen. The game utilizes a synchronized local storage system that saves your progress automatically. Every time you enter a number or make a note, the game creates a snapshot of your board. You can safely close your browser and return exactly where you left off later.
Why play Sudoku online?
Playing online offers advantages that paper puzzles cannot match. Features like mistake tracking and auto-save make the learning process smoother, while the instant availability means you can train your brain whenever you have a few spare minutes.
