Sudoku 9x9 is a classic number puzzle game where you fill a 9x9 grid so that every row, every column, and each of the nine 3x3 squares contains the digits 1 through 9 without repeating. The rules are simple to learn, but the challenge scales fast depending on how many numbers are pre-filled when you start.

This free browser-based version gives you three difficulty levels — easy, medium, and hard — so you can warm up or seriously test your logic skills. Stuck on a tricky cell? Use the built-in hint system to get a nudge without giving up entirely. The clean grid layout makes it easy to spot conflicts, and since it runs on HTML5, it plays smoothly on desktop and mobile without any downloads or sign-ups required.

Sudoku 9x9 is perfect for puzzle fans who want a quick mental workout during a break or a longer session to sharpen their deductive reasoning. Whether you're searching for a free sudoku game online, a classic number puzzle for beginners, or a hard sudoku challenge to push your skills, this game covers all levels. It's also a solid pick for anyone who enjoys brain training games, logic puzzles, or grid-based strategy games. Play directly in your browser and see how fast you can solve the board.