Sudoku is nine palaces, and each palace is divided into nine squares. Give some known numbers and problem-solving conditions in this eighty-one box, and use logic and reasoning to fill in the numbers of 1 to 9 in other blanks. Make every number of 1 to 9 appear only once in every row, column and house.
Sudoku, formerly known as "Jiugongge", originated in China, and its characteristics are more complicated than the current Sudoku. It requires that the sum of three numbers in vertical direction, horizontal direction and diagonal direction is equal to 15, instead of a simple non-repeatable nine numbers.
1783, the then Swiss mathematician leonhard euler invented a game called "Latin Square". This game is an N-by-N number box, and each row and column consists of N non-repeating numbers or letters.
65438+In 1970s, an American magazine with mathematical logic games, Dell pencil crossword puzzles and word games began to publish what is now called Sudoku. At that time, people called it a "digital puzzle". At this time, a 9-by-9 8 1 grid number game began to take shape.