The 81 squares are a traditional mind game consisting of 81 squares, each of which can be filled with a number from 1 to 9, so that each row, each column, and each 3x3 cell contains a number from 1 to 9.
To solve the eighty-one squares, the following is the simplest method:
1.Observe the whole: Start by looking at the entire 81 squares to see if there are any duplicate or missing numbers. If so, you can fill in the number in the appropriate field first.
2.Row by line: From the first row, observe the occurrence of each number, line by row. If a number appears only once in a row or column, you can fill in the number in the appropriate position.
3.3x3 Grids: Observe each 3x3 grid, if there is only one number in a grid, you can fill in the number in the grid.
4.Exclusion: Observe the numbers that have been filled in, and if a number appears twice or more in a row or column**, then the number can be excluded.
5.Try: If none of the above methods solve the problem, you can try to fill in a certain number in a certain field and then observe whether it meets the requirements. If you don't meet the requirements, try a different number.
Through the above methods, the problem of 81 square grids can be solved step by step. It should be noted that solving the eighty-one grid requires patience and care, and do not rush it. At the same time, it is also important to maintain a mindset to avoid losing the game experience by failing.