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.