You are playing Sudoku. Do not forget to play one of the other great Puzzle Games at glitchhollow-guild.org!
Sudoku
Amazing SudokuAmazing Sudoku Daily Sudoku ChallengeDaily Sudoku Challenge New Daily SudokuNew Daily Sudoku Super SudokuSuper Sudoku Math KingMath King Daily SudokuDaily Sudoku Mahjong MatchMahjong Match Word Connect PuzzleWord Connect Puzzle Parking JamParking Jam 2048 X2 Merge Blocks2048 X2 Merge Blocks Mystic Sea TreasuresMystic Sea Treasures Traffic ParkingTraffic Parking 2020 Connect2020 Connect Best Classic Mahjong ConnectBest Classic Mahjong Connect Traffic Tap PuzzleTraffic Tap Puzzle iColorcoin Sort PuzzleiColorcoin Sort Puzzle Emerland SolitaireEmerland Solitaire Mary Knots Garden Wedding Hidden ObjectMary Knots Garden Wedding Hidden Object Kings and Queens Match 3Kings and Queens Match 3 Wave DashWave Dash Cube Drop PuzzleCube Drop Puzzle Word ClashWord Clash Obby Blox HookObby Blox Hook Sort And Style: Back To SchoolSort And Style: Back To School Geometry RushGeometry Rush Knock and Run: 100 Door EscapeKnock and Run: 100 Door Escape Cake Sorting DeluxeCake Sorting Deluxe Sum MasterSum Master Pizza TycoonPizza Tycoon Bubble ShooterBubble Shooter Mahjong ConnectMahjong Connect Fireboy and Watergirl 1: Forest TempleFireboy and Watergirl 1: Forest Temple Geometry ArrowGeometry Arrow Gorillaz TilesGorillaz Tiles Mahjong ClassicMahjong Classic Solitaire ClassicSolitaire Classic Love TesterLove Tester ImpostorImpostor Butterfly KyodaiButterfly Kyodai Kris MahjongKris Mahjong Moto X3MMoto X3M Block BlastBlock Blast Treasures of the Mystic SeaTreasures of the Mystic Sea Jewels Blitz 6Jewels Blitz 6 Magic Tiles 3Magic Tiles 3 Pet ConnectPet Connect Jewels Blitz 4Jewels Blitz 4 Jewels Blitz 5Jewels Blitz 5 Mahjong DimensionsMahjong Dimensions Garden TalesGarden Tales Love Tester 3Love Tester 3

Sudoku

3.3
3.434 votes

Play Sudoku online for free

Sudoku is a classic and fun puzzle game, where you solve the puzzle by placing the numbers in the right spots. Find all the right spots for the right numbers, and complete a sudoku on every difficulty. Start with the easy difficulty, where more numbers are revealed, and go all the way to expert! Have fun in this free to play thinking game.

The gameplay of Sudoku

You start the level with some numbers already revealed. Every line, vertically and horizontally, and every one of the 9 squares, needs to have the numbers 1 through 9. So every number only has 1 correct spot. Find all the right spots for the numbers, by looking at the numbers that have already been placed, and then looking at what spots are left for the number to be in. 

This game is a real brain cracker. Your thinking skills will be tested to the limit. Fill in all the correct numbers as fast as you can to win in Sudoku!

Games similar to Sudoku

Another fun Sudoku game is New Daily Sudoku, where you try to defeat the daily sudoku challenge, every single day.

Controls
Use your mouse
ConcentrationConcentration NumbersNumbers PuzzlePuzzle SudokuSudoku

FAQ - Frequently Asked Questions

What distinguishes a 'diagonal' Sudoku from a regular one?

In a diagonal Sudoku, in addition to the regular rules, the two main diagonals must also contain 1-9 once.

Why are some cells shaded in certain Sudoku puzzles?

Shaded cells, often found in variants like “Center Dot” or “Asterisk”, add extra constraints or patterns to solve.

What's a 'naked pair' in Sudoku strategy?

A 'naked pair' occurs when two cells in a row, column, or box have only the same two possible numbers. These numbers can be eliminated from other cells in that unit.

Is it possible to solve every Sudoku without guessing?

Yes, every valid Sudoku has a logical pathway to its solution. Guessing is not necessary when applying the right techniques.

How does the 'swordfish' technique work in Sudoku?

The 'swordfish' is a technique that deals with candidates that appear exactly three times in rows OR columns. When these align correctly, other candidates can be eliminated.

Can a Sudoku have multiple solutions?

A well-constructed Sudoku should only have one solution. Multiple solutions suggest the puzzle isn’t crafted properly.

What’s the significance of 'givens' in Sudoku?

Givens' are the numbers pre-filled in the puzzle. They provide the starting point and their placement determines the puzzle's difficulty.

How does the 'X-wing' strategy help in solving Sudoku?

The 'X-wing' focuses on two rows and columns. When two numbers can only fit in the exact two columns in those rows (or vice-versa), they can be removed elsewhere.