The Swiss Mathematician Leonhard Euler invented the up and coming popular number puzzle of Sudoku. He first invented the game back in 1783 which is impressive in itself.
Sudoku is basically a test of logic which has spread in popularity in such countries as the United States, Japan and Britain. Sudoku has entered the Swiss market since June 2005 and can be found in Swiss newspapers, bookstores and on other blogs.
A few sites which show you how Sudoku works can be found below:
1. Find out how to solve the puzzle.
2. Sudoku Tutorial
3. Daily puzzle of Sudoku
You can read the full article about Sudoku thanks to Swiss Info.