Sudoku is a classic logic-based number puzzle where the goal is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9.
This browser-based version allows you to play this timeless brain-teaser using just your mouse, offering a clean interface for puzzle enthusiasts of all skill levels.
The rules of Sudoku are straightforward, but the game offers deep strategic challenges. The game begins with a partially filled 9x9 grid. Your task is to place the numbers 1 through 9 in the empty cells.
The core constraint is that each number can only appear once in each horizontal row, each vertical column, and each 3x3 box.
You solve the puzzle through deduction. By looking at the numbers already on the board, you can logically figure out where the missing numbers must go. There is only one unique solution to every properly formed Sudoku puzzle.
If you're new to Sudoku, a great starting point is to scan rows and columns for obvious placements. Look for a row, column, or 3x3 box that is missing only one number and fill it in. This is known as finding a 'sole candidate'.
Another simple technique is cross-hatching. Pick a number, say '7', and look at a 3x3 box where it's missing. Scan the rows and columns connected to that box.
If you see a '7' in two of the three relevant rows and two of the three relevant columns, you can often pinpoint the only available cell for the '7' in that box.
You can enjoy Sudoku for free directly in your web browser. This version requires no downloads or installations, making it easy to play on any computer, including those on school or work networks.
Simply load the page and start solving puzzles instantly for a great mental workout.
The objective in Sudoku is to completely fill the 9x9 grid with numbers from 1 to 9. The puzzle is solved when every row, every column, and every 3x3 box contains each digit exactly once.
Controls are simple and intuitive. Use your mouse to left click on an empty cell you want to fill. After selecting a cell, click on a number from 1 to 9 on the on-screen keypad to place it in that cell.
Begin by identifying the easiest numbers to place. Look for rows, columns, or boxes that are almost full. Use the given numbers as clues to deduce the placement of the missing ones. Continue this process of logical deduction until the entire grid is correctly filled.
Scan First - Before making a move, quickly scan the entire grid to get a sense of the layout and identify which numbers are most frequent or which areas are most complete.
Use Pencil Marks - For harder puzzles, use the note-taking or 'pencil' feature to jot down possible candidates for a cell. This helps you track possibilities without committing to a number.
Focus on One Number - Try to place all instances of a single digit (e.g., all the '5's) across the board. This can often unlock several other placements.
Check for Singles - Regularly look for cells that can only hold one possible number (a 'naked single') or numbers that can only go in one specific cell within a box (a 'hidden single'). Don't Guess - Sudoku is a game of pure logic.
Guessing can lead to mistakes that are difficult to find and correct later. If you're stuck, re-examine a different part of the grid.
