The number but a seedling source from 18 century's ends Switzerland, latter develops, and mathematics intelligence in US which carries forward in Japan puts together the chart game. The number alone slights the law the logic to be simple, the digital arrangement way ever changing, many educations reveals the number but to exercise the brain the good method! Game rule: In 9×9 the Taisho square shape, each line all must fill in 1 with each row to 9 numerals, cannot duplicate cannot be few; In each in the small section paper which separates by the heavy line, also must fill in 1 to 9 numerals, similarly cannot duplicate cannot be few.