Rules

Sudoku

The rules of Sudoku is simple. You are given a board with 9 columns, 9 rows and 9 regions.

  • Each row must contain all numbers from 1 to 9
  • Each column must contain all numbers from 1 to 9
  • Each region must contain all numbers from 1 to 9

No calculations are involved. To solve a Sudoku all you need is logic. There are many sites out there with tips and tricks for solving Sudokus. See for example WikiHow's page on Sudoku solving.

Challenges

When you have solved a Sudoku you will be told your time and given the option to challenge a friend.

Fill out your name and email, the name and email of a friend and add a short message to start a challenge. Your friend will then receive your message and a link to the same Sudoku that you just solved.

When your friend has solved the Sudoku you will get a mail with the result of the challenge. Remember to brag a lot if you win!