Sudoku Online Hard

  1. Daily Sudoku Online Hard
  2. Free Sudoku Online Hard
  3. Online Sudoku Easy Medium Hard
  4. Sudoku Hard Level

Sudoku Rules

Play extremely hard Sudoku puzzles in our expert area. More Extremely Difficult Sudoku Puzzles. Your Free Sudoku Puzzle: (L6: #236909620) Save.

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.

  • Easy Medium Hard Very hard. How To Play Sudoku. The goal is to fill in all the empty cells on the board with the correct numbers. Cells each take a number between 1 and 9. A number may only appear once in a single row, column or three-by-three box.
  • Play very hard sudoku online: print begin a new puzzle Your time:. (c) Puzzle by sadmansoftware.com.
673924518
895136427
142758693
251489376
984673251
367215849
516892734
429367185
738541962
673924518
895136427
142758693
251489376
984673251
367215849
516892734
429367185
738541962
673924518
895136427
142758693
251489376
984673251
367215849
516892734
429367185
738541962

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

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.

New game

The save of the current game will be lost.

Hard
00:00

8

5

1

2

7

6

2

3

1

9

7

2

2

9

5

Fair go casino new. 7

Warning, there are errors!
To display the candidates there must be no errors.
Do you want to delete them automatically?

YesNo

You have a game in progress!
Would you like to resume it?

Daily Sudoku Online Hard

Sudoku Online HardOnlineYesNo

Congratulations!

Time
2
4
6
8

Free Sudoku Online Hard

Box Format
Error Checking
Advertising:

Online Sudoku Easy Medium Hard

Advertising keeps this Sudoku site alive and we have minimized it to make the game more enjoyable for you.
But the animated ads can interfere with the resolution of the grid, so you can Deactivate ✂ .

You play hard level puzzles, well done, because you are part of the family of good Sudoku players. Indeed, hard sudoku calls for advanced level techniques and good deduction logic. In free online hard sudoku, you can help yourself to the candidates in each square and use logical techniques.

How do I play Sudoku?

The goal is to fill the grid, so that each row, each column and each region of 3x3 cells contain all the digits from 1 to 9.
Glossary of game options:
Clear the contents of the box
Undo the last move
Visual aid
Redo last move
Automatic selection of boxes on hover (on computer)
Show all possible candidates on the grid
Show / Hide solution

Why play hard sudoku?

Sudoku Hard Level

Hard sudoku can be useful in a progression of learning advanced solving techniques, but it is also played by amateurs and professionals of sudoku.
is an excellent training in techniques of detection of duplicates, triplets and other techniques. A little more effort and you will become an expert (if you haven't already).

Play sudoku with 5 difficulty levels: easy, medium, hard, expert, evil