数独－无广告数独游戏

【Introduction to Sudoku】
Sudoku is a mathematical game originating from Switzerland in the 18th century. It is a logical game that uses paper and pen for calculation. Players need to infer the numbers in all the remaining empty cells based on the known numbers on the 9×9 board, and ensure that the numbers in each row, each column, and each thick-lined palace (3*3) contain the numbers 1-9 without repetition.
The Sudoku board is a nine-square grid, and each palace is further divided into nine small cells. Given certain known numbers and problem-solving conditions in these eighty-one cells, using logic and reasoning, fill in the numbers 1-9 in the other empty cells. So that each number from 1 to 9 appears only once in each row, each column, and each palace, so it is also called the "nine-square grid".

【Origin of Sudoku】
Since one of the characters in "Sudoku" is "number", people often associate it with mathematics. Then let's start with the well-known mathematician Euler. Whenever players who want to understand the history of Sudoku search on the Internet or in books, the "Latin square" of Euler is commonly mentioned.
The rules of the Latin square: Each row (Row) and each column (Column) contain 1-N (N is the size of the board) without repetition. This is very similar to the standard Sudoku mentioned earlier, but it lacks the rule of a palace.

【Modern Development of Sudoku】
Sudoku originated from the Latin square studied by Swiss mathematici...