Sudoku rules
Obvious triples
Obvious triples
This Sudoku solving technique is built upon the previous one - "Obvious pairs". But "Obvious triples" is not based on two numbers from the Notes, it's based on three. This is the only difference. To understand better, let's take a look at the example.
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Hidden singles
Hidden singles
"Hidden singles" is a quite simple Sudoku technique. The point of "Hidden singles" is that a Note is the only one of its kind in an entire row, column, or 3x3 block. However, this technique requires careful attention from the player, because it can be quite hard to spot the single Notes.
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Hidden pairs
Hidden pairs
"Hidden pairs" technique works the same way as "Hidden singles". The only thing that changes is the number of cells and Notes. If you can find two cells within a row, column, or 3x3 block where two Notes appear nowhere outside these cells, these two Notes must be placed in the two cells. All other Notes can be eliminated from these two cells.
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Hidden triples
Hidden triples
"Hidden triples" technique is very similar to "Hidden pairs" and works on the same concept. 
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Pointing pairs
Pointing pairs
"Pointing pairs" applies when a Note is present twice in a block and this Note also belongs to the same row or column. This means that the Note must be the solution for one of the two cells in the block. So, you can eliminate this Note from any other cells in the row or column.
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Pointing triples
Pointing triples
"Pointing triples" technique is very similar to "Pointing pairs". It applies if a Note is present in only three cells of a 3x3 block and also belongs to the same row or column. This means that the Note must be a solution for one of these three cells in the block. So, obviously it can't be a solution of any other cell in the row or column and can be eliminated from them.
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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!