"Doku" is also "Sudoku", which means "a single number" or "a number that only appears once." In a nutshell, it is a number-filling game. But this concept did not originally come from Japan, but from the Latin square, which was invented by the Swiss mathematician Euler in the 18th century. Euler, born in 1707, is regarded as one of the greatest mathematicians of all time.

The rules of the Sudoku game are very simple. There are already a number of numbers in the 9x9 grid, and other palaces are left blank. Players need to logically figure out what numbers are in the remaining spaces, so that each row Each column has numbers from 1 to 9, and each small jiugong grid also has numbers from 1 to 9, and a number can only appear once in each row and each small jiugong grid.

You need to use software to design. The following software has relatively complete functions: hodoku, Sudoku Explainer, SudoCue, Simple Sudoku, Color Sudoku, infinite Sudoku, etc.

Extended information:

Sudoku Competition

1. World Sudoku Championship: the highest level international Sudoku competition organized by the World Puzzle Federation , this event is held once a year and is hosted by different member states in turn. The first one was held in Lucca, Italy in 2006, and the eighth one was held in Beijing in 2013. Every year, the only authorized organization of the World Intellectual Property Organization in each country selects the national team to participate.

2. Beijing International Sudoku Grand Prix: An international Sudoku event hosted by Beijing Radio and Television Station. The event has high prize money and has attracted many international experts to actively participate, providing domestic experts with opportunities. A platform where you can compete with foreign experts. The first one was held in 2011, and the second one was held in May 2012. The current domestic contestants are all those who have entered the Sudoku national team in the past or ranked among the best in domestic trials.

3. China Sudoku Championship: It is held annually by the domestic organization authorized by the World Intelligentsia Federation, with the purpose of selecting the Sudoku masters of that year to form a team to participate in the annual World Sudoku Championship. There is no threshold for this competition, and both newcomers and veterans can participate. Please pay attention to the official Sudoku Trial Notice for the specific time and location.

Baidu Encyclopedia-Sudoku