Sudoku

Sudoku, the popuplar puzzle that uses the numbers 1-9, is a very famous game but it isn’t very new!

I fact it is based on the work of Leonard Euler, a Swiss mathematician of the 19th century.

He created “Latin Squares”, a grid in which every number or symbol appears once in each row or column.

A similiar puzzle appeared in an American magazine in 1970.

In 1984 a Japanese publisher saw the puzzles and was impressed.

He made them easier, called them “Sudoku” and published them in a book.

But nobody showed much interest in them.

In 2004 Wayne Gould, a new Zealander, persuaded The Times to publish one of the puzzles.

It was a big success and now you can find Sudoku puzzles everywhere!

Ilaria and Letizia M.