Sudoku Solver
Want To Play Sudoku? Click Here to start a game

Want To Play Sudoku? Click Here to start a game

Choose preferred difficulty level

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How to use

Some texts goes here.
CHECK
Checks if the Sudoku puzzle is valid and can be solved
HINT
Get a hint.
CANDIDATES ON/OFF:
Show/Hide candidate values in empty cells
CLEAR
Clears the puzzle
UNDO
Undo moves step by step
PRINT
Opens a new window from which the sudoku puzzle can be printed
SHARE
Share the puzzle
COUNT SOLUTIONS
counts the number of solutions
GENERATE
Generate puzzles. There are 4 different levels: simple, easy, intermediate and expert
LOAD
Loads saved puzzles
SAVE
Saves current puzzle
SAVE AS
Saves as current puzzle. So cou can have the same puzzle under different names
SOLVE
Solves the Sudoku puzzle completely
SOLVE CELL
Solves a single cell. Click in the cell you want to solve first, then click this button

What you need to know about sudoku: Sudoku is a game of logic, based on a grid of 9 columns and 9 rows. This is sub-divided into nine 3 x 3 squares. A completed Sudoku puzzle comprises this grid completely filled with the numbers 1 - 9 appearing exactly once in each row, column and square. You can see an example grid to the right. Another thing about sudoku - as you go through solving it, you will need pencil-marks to keep track of what goes where, these are shown by the small numbers to the right. Each Sudoku puzzle, or at least each valid puzzle, has one unique solution. The difficulty varies depending on how many numbers you are given to start with - the more numbers usually the easier the puzzle. Puzzles also tend to be symmetrical. Another thing about sudoku solver - you should be able to use logic to solve each puzzle and never need to make a guess and hope for the best! This is achieved by implementing 'human solve algorithms' in the puzzle generators (or making them by hand). From the starting grid, you should be able to deduce the number that must go in every square of the grid, number by number. You should not have to guess at any values if the grid has been correctly generated. There are a number of simple strategies that you can use to help you solve the Sudoku grid. So that's all you need to know about sudoku, now it is time to start playing! We have literally hundreds of sudoku puzzles for you to play at our online Puzzle Club, across many different genres of the puzzle including some variants you may not have come across before.