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Sudoku Solver

Tool to solve sudoku/wordoku grids (directly or step by step). Sudoku is a game whose purpose is to fill a 9x9 grid with digits (or letters, or symbols) in order to get only one per line, column and block. A bloc is a delimited portion of the grid, by defaut sub-grid 3x3.

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Sudoku Solver -

Tag(s) : Number Game, Solver

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# Sudoku Solver

## Solve a sudoku grid

 Resolution Compute all solutions Step by Step Solution

Tool to solve sudoku/wordoku grids (directly or step by step). Sudoku is a game whose purpose is to fill a 9x9 grid with digits (or letters, or symbols) in order to get only one per line, column and block. A bloc is a delimited portion of the grid, by defaut sub-grid 3x3.

### How to fill the Sudoku grid?

Make a copy/paste or type directly in cells. Letters (Wordoku) and digits are accepted.

Example: Copy the content in the first cell 97 1 5 5 9 2 18 4 8 7 26 92 3 6 2 9 19 457  to get :

 9 7 1 5 5 9 2 1 8 4 8 7 2 6 9 2 3 6 2 9 1 9 4 5 7

### How does the step by step works?

Software solves the Sudoku just like an human and display each step of its progress to understand.
Sometimes, no logical reasoning is possible, the software make a random selection among the possible values for a cell and continue, if an incoherence happens (the sudoku becomes unsolvable), it rolls back to the random step and try another value.

If the program indicates that there is only one possible value, it means that no other value is acceptable in the box.

### How to test if a sudoku has a unique solution?

dCode calculates all possible answers for the sudoku, not only the first one. If you have created a homemade sudoku, it is the perfect choice to check whether there are multiple solutions but only one possibility.

### When Sudoku have been invented?

The first Sudoku versions are from 1979