Sudoku

Goal

This puzzle is called Number Place or Sudoku.
You have to fill 3 by 3 empty blocks with the numbers of 1 through 9.

How to play

This application offers automatic answers to solve the puzzles stored in the library.
Click on a block to enter numbers.

Difficulty

• Easy - Easily solved if you understand the rules.
• Normal - Use basic techniques.
• Hard - Use Naked Pairs.
• Very Hard - Use xy-wing , Hamada's Logic , Remote Pairs , x-wing ,
  Sword fish , Jerry Fish , Squirmbag.

The more points you get, the harder the puzzle becomes.