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The Challenge
Sudoku
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.
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.