Milions of people are hooked on sudokus. In a sudoku you have to complete a puzzle of numbers from 1 to 9.
Try it! It is believed that Sudoku was originally an American game, not Japanese. If you want to know more about sudokus, listen and read this abstract. After listening and reading, try to answer the questions you’ll find in the comment attached. If you want to play a sudoku you only have to click on the picture above.