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. Hard Sudoku differs from easier difficulties, in that there can be multiple spaces where the answer is not immediately obvious. This hardest Sudoku puzzle is characterized by the fact that only a few numbers are shown in the Sudoku square, which consists of 9 small squares, where the cells are located 3x3. Sudoku Rules The basic rule is that each digit can appear only once in each row, column, and small square. Average Sudoku Puzzle: play online for free and print We use cookies to personalise content and ads, and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information you’ve provided to them or they’ve collected from your use. Easy Medium Hard Evil Try Variations Download Deluxe. Every Sudoku has a unique solution that can be reached logically. Enter numbers into the blank spaces so that each row, column and 3x3 box contains the numbers 1 to 9 without repeats. Play Offline with Web Sudoku Deluxe Download for Windows and Mac. Create your own Sudoku Ebook.
Sudoku Rules
Sudoku is a number puzzle where the objective is to fill every row, column and box (3x3 grid) with the numbers from 1-9. Each unit (row, column or box) must have each number exactly once. The game starts with a number of fields pre-filled. Your objective is to fill the rest of the fields without breaking the constraints that each number can only be once in each row, column and box.
| 6 | 7 | 3 | 9 | 2 | 4 | 5 | 1 | 8 |
| 8 | 9 | 5 | 1 | 3 | 6 | 4 | 2 | 7 |
| 1 | 4 | 2 | 7 | 5 | 8 | 6 | 9 | 3 |
| 2 | 5 | 1 | 4 | 8 | 9 | 3 | 7 | 6 |
| 9 | 8 | 4 | 6 | 7 | 3 | 2 | 5 | 1 |
| 3 | 6 | 7 | 2 | 1 | 5 | 8 | 4 | 9 |
| 5 | 1 | 6 | 8 | 9 | 2 | 7 | 3 | 4 |
| 4 | 2 | 9 | 3 | 6 | 7 | 1 | 8 | 5 |
| 7 | 3 | 8 | 5 | 4 | 1 | 9 | 6 | 2 |
| 6 | 7 | 3 | 9 | 2 | 4 | 5 | 1 | 8 |
| 8 | 9 | 5 | 1 | 3 | 6 | 4 | 2 | 7 |
| 1 | 4 | 2 | 7 | 5 | 8 | 6 | 9 | 3 |
| 2 | 5 | 1 | 4 | 8 | 9 | 3 | 7 | 6 |
| 9 | 8 | 4 | 6 | 7 | 3 | 2 | 5 | 1 |
| 3 | 6 | 7 | 2 | 1 | 5 | 8 | 4 | 9 |
| 5 | 1 | 6 | 8 | 9 | 2 | 7 | 3 | 4 |
| 4 | 2 | 9 | 3 | 6 | 7 | 1 | 8 | 5 |
| 7 | 3 | 8 | 5 | 4 | 1 | 9 | 6 | 2 |
Sudoku New York Times Hard
| 6 | 7 | 3 | 9 | 2 | 4 | 5 | 1 | 8 |
| 8 | 9 | 5 | 1 | 3 | 6 | 4 | 2 | 7 |
| 1 | 4 | 2 | 7 | 5 | 8 | 6 | 9 | 3 |
| 2 | 5 | 1 | 4 | 8 | 9 | 3 | 7 | 6 |
| 9 | 8 | 4 | 6 | 7 | 3 | 2 | 5 | 1 |
| 3 | 6 | 7 | 2 | 1 | 5 | 8 | 4 | 9 |
| 5 | 1 | 6 | 8 | 9 | 2 | 7 | 3 | 4 |
| 4 | 2 | 9 | 3 | 6 | 7 | 1 | 8 | 5 |
| 7 | 3 | 8 | 5 | 4 | 1 | 9 | 6 | 2 |
Sudoku Strategy
The basic gameplay, which will be enough to solve many easy Sudoku puzzles, is simply to look at an empty field and eliminate all numbers that are already present in the row, column and box it belongs to. In many cases this will be enough to find the correct number. And of course as soon as you've found the right number for one field, it will be easier to figure out other fields in the same row, column or box.
When you get into more difficult situations there are a number of different strategies you can use. The excellent page Sudoku Dragon has a good strategy page that covers many basic strategies as well as some advanced ones.
Controls
Sudoku Online Hard
You click on the squares you want to put numbers in, and then either click the numbers buttons on the screen, or the number keys on your keyboard to fill them in. If the 'Multinumber' button is pressed then you can put more than one number in each square, it will show as small numbers if there are more than one number in the square. However, in some cases you might want to put just one number in the square and still have it be small, if you think it should be there but are not sure. In that case, hold down the shift key on your keyboard and press the number key, if you do that there will always be a small number in the square, even if there's just one number there.