The purpose of this website is not to supply a complete sudoku solution for you, though it can do that.
The idea is to provide a help companion for you when doing a sudoku puzzle.
You can check all the potential values in any given unknown cell and apply your own logic,
or you can ask the sudoku help to provide a hint and suggest which square is able to be solved next
and by what logic.
Click on any square on the grid to enter a number.
Key the starting numbers of the sudoku puzzle from your newspaper, book, or magazine.
Of course you can also enter any numbers you may have calculated yourself so far.
At any point you can enter your own numbers, but unless they are entered correctly the puzzle will
not be able to be completed by this utility.
From the menu on the right hand side, click;
Show/Hide Possible Values
- click this to see all possible values for each unknown cell on the grid.
Click again to hide the possible values.
The possible values are very useful and will save you the time of calculating and recalculating these
during the solving of a sudoku puzzle. Any time the value of a known cell is supplied then these values are
recalculated and shown.
SuDokuHelp can be used with this feature only and not be considered as "cheating" as you are not using any
code to supply the unknown values but you are applying your own logic.
It is very heplful to switch the possible values on when you are using the hint suggest button as
this helps to explain the logic behind the hint suggestion.
Hint Suggest One
- to show a solvable square with some hint text at the bottom.
Determine the only possible value in this position, and key it in manually
(by clicking on the relevant square and using numbers 1 to 9).
The hints are numbered in order of ease of calculation, and the sudoku helper will always attempt the
most straightforward logic first.
All other possible numbers have been used in this cell's horizontal line, vertical line, and 3x3 block.
So by a process of elimination, this must the only remaining digit.
In this nine square three-by-three block this is the only possible square that can be one particular digit from 1 to 9.
In this nine square horizontal row this is the only possible square that can be one particular digit from 1 to 9.
In this nine square vertical column this is the only possible square that can be one particular digit from 1 to 9.
Twins can be found where two squares in the same row, column or 3x3 block can only possibly be the same
two digits. As a result none of the others in the same group of 9 (either row, column or block) can be either of
these two numbers.
No logical step can be used to find a definite value for the next cell.
So the sudoku helper will find a cell this the least possible values and "guess" one of them,
then follow this through to see if the complete puzzle can be completed successfully, making other "guesses"
along the way if necessary. If the complete solution is not found then alternative "guesses" will be attempted.
Not enough digits are supplied to be able to calculate another cell value.
A complete solution is in the grid.
If you cannot work out the value of a square from the suggested hints, then click the following option.
- this will show you the correct digit for this cell, with an explanation
at the bottom of the grid to explain how this was calculated.
See above for a detailed list of the possible explanations.
- this completes the entire puzzle and shows the complete correct solution.
You can combine manual keying of numbers with the suggest and calculate one functions.
Click on "Example - Hard" to fill the Su Doku square with the starting numbers.
The initial digits on the grid are fixed and should not be changed.
A detailed walkthrough of this example will appear here soon.
Su Doku (or Sudoku, even Sun Doku in one newspaper) puzzles are the craze taking the world by storm.
Most daily newspapers are printing them, there are books available, and even specialist sudoku magazines.
The name comes the japanese "Su" meaning number, and "Doku" meaning single.
Help support this site by buying Su Doku books from amazon using any of the links on this page.
The number of books available are growing rapidly, ranging from books simply full of puzzles from The Times,
The Telegraph and The Sun, to How To Solve Sudoku & Sudoku For Dummies.
Bear in mind that it is only online that you can get a truly interactive Su Doku puzzle hint companion & helper
like this one.