Sudoku Coach

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Sudoku is a game of pure logical deduction, where no guessing is ever required in the puzzle game. Hard Sudoku may test your belief in this, but just stick to logic, and you are sure to power your way through to an ultimate Hard Sudoku win! Sudoku game play is the same as all other difficulties on 24/7 Sudoku. Place the numbers 1 through 9 into each row, 3x3 box, and column only once. Complete the entire sudoku puzzle with the correct numbers to win.

How to play Sudoku. Guides for new and experienced players. How to solve a sliding tile puzzle. If tiles are tripping you up, watch this simple strategy. A Sudoku X-Wing pattern occurs in many of the more difficult Sudoku puzzles. Your ability to identify and solve this pattern will often break the logjam and lead you to the solution of a challenging Sudoku game. In this article, I use one of my hand crafted very difficult puzzles that has a known X-Wing pattern. Sudoku Coach is useful to overcome a difficult step for a grid (when you find yourself a little stuck), but also to train and learn the techniques of sudoku experts, applying them to the real case which we are confronted.

About this Sudoku Solver. This solver offers a number of features to help you improve your solving skills and practice solving strategies. Enter the numbers of the puzzle you want to solve in the grid. You can solve the puzzle completely, partially or solve a single cell using the buttons in the Solving section of the Features.

Hard Sudoku differs from easier difficulties, in that there can be multiple spaces where the answer is not immediately obvious. This level of sudoku difficulty may require you to use more complex ways of solving, not just simple logic like you've used in both Easy and Medium difficulties. These advanced sudoku techniques most times involve discovering patterns in your sudoku board. Remember, no guess work is involved in this logical game, so just keep trying, and you're sure to become a victorious Hard Sudoku master!

  • Sudoku is a game of logical deduction with no guessing required.
  • Hard Sudoku is more difficult than Easy and Medium, as not all answers are immediately obvious.
  • Use sudoku pattern searching techniques to win this Hard Sudoku puzzle game!

DISCLAIMER: The games on this website are using PLAY (fake) money. No payouts will be awarded, there are no 'winnings', as all games represented by 247 Games LLC are free to play. Play strictly for fun.

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The essential solving technique for all Sudoku puzzles


All correctly formed Sudoku puzzles are solvable using logical solving techniques. The majority of puzzles can be solved using just one key technique.

As you know, the numbers from 1 to 9 must be placed once in every block. Using this knowledge, one can attempt the easiest technique: identifying a unique number to go in each block in the grid.

Figure 1

Here, you can see the highlighted block has 4 out of 9 squares present. Generally, it at the beginning it is wise to choose blocks that are more complete: these often lead to some easy squares to solve.

Look along to the blocks to the left, right and below. Scan for any of the numbers: 1, 2, 3, 5 or 7 that have yet to be placed in this block.

You should be able to spot a 3 to the right, eliminating the possibility of another 3 in the top row.

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Figure 2

If you look down from this block, there is a second 3 allocated to the first column in the block.

Now, both the top row and the first column of the block already contain a 3. With the row and column eliminated, there is only one square remaining for the 3 in the block. You can now place the 3 as shown below.

Figure 3

This method is relatively easy, provided you can identify good numbers to search for.

Continuing with the same method, there is an easy 6 in the centre left block.

Figure 4

The next method is very similar as it utilises the same technique, but this time for rows and columns.

The Sudoku has several near-complete rows and columns. Pick one and identify the numbers that are missing.

Figure 5

In this column, there is space for a 2, 6 and 9. However, the 6 can only lie in one of the 3 available squares as there is a 6 to the left of the other remaining gaps in the column.

Figure 6

Generally, it is a good idea to focus initially on the same number. In the past example, you can see that the first 6 lead directly to finding the 6 in the column.

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Continuing along this line, it is easy to spot another 6 in the block above.

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Figure 7

On this occasion, you can place the final 6 in the bottom centre block. Usually, it would not be possible to place all the remaining numbers in sequence.

Figure 8

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In fact, this 6 is particularly easy to spot. There are other 6s in blocks above and to the left and right. In addition, the 6 has only one remaining place for this row and column.

Figure 9 demonstrates the different techniques that can go into finding a particular value.

Figure 9

Similar techniques are used to solve this medium rated Sudoku puzzle.