Sudoku rules
Х-wing
Х-wing
"Х-wing" is an advanced sudoku technique, which is based on the two parallel rows or two parallel columns. You shouldn't pay attention to the 3x3 blocks as they aren't involved in this strategy.
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Y-wing
Y-wing
"Y-Wing" technique is similar to "X-Wing", but it based on three corners instead of four.
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Swordfish
Swordfish
The "Swordfish" technique is an advanced Sudoku strategy. It's usually applied in the hard levels of Sudoku puzzles to eliminate candidates. "Swordfish" is similar to X-wing but uses three sets of cells instead of two.
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What is Sudoku and what are the rules of this game?

Sudoku is a popular logic puzzle with numbers. Its rules are quite simple, so even beginners can handle the simple levels.

What are the basic rules of Sudoku?

  • Sudoku grid consists of 9x9 spaces.
  • You can use only numbers from 1 to 9.
  • Each 3×3 block can only contain numbers from 1 to 9.
  • Each vertical column can only contain numbers from 1 to 9.
  • Each horizontal row can only contain numbers from 1 to 9.
  • Each number in the 3×3 block, vertical column or horizontal row can be used only once.
  • The game is over when the whole Sudoku grid is correctly filled with numbers.

There are already many numbers filled in on the grid in the simple Sudoku puzzles. Therefore it’s not so difficult to cope with the solution if you are familiar with the basic rules. However, in order to solve difficult levels and deal with them quickly, you need to use some tricks and learn advanced Sudoku techniques.

Our Sudoku guide has a lot of tutorial videos for players of all skill levels: from Sudoku absolute beginners to experts. Watch the videos to check out all the rules, tips and strategies of Sudoku and enjoy the game!