Sudoku (Japanese: The number is alone す う ど く) is a seedling source from 18 century's ends Switzerland, latter develops, and mathematics intelligence in US which can carry forward in Japan puts together the chart game. Puts together the chart is the section paper (namely 3 standards widths ×3 standard is high) 正方 the shape, each standard also subdivides is section paper. In each small section paper, separately fills in 1 to 9 numerals, lets the entire big section paper each row, each line of numeral not be all redundant. The number alone slights the law the logic to be simple, digital arrangement way ever changing. Many educations thinks the number but to exercise the brain the good method.