Attractive Sudoku

Attractive Sudoku is a number logic game typically composed of 9x9 squares, divided into 9 small 3x3 squares. The goal of the game is to fill in the numbers 1 to 9 in each row, column, and small cell, so that each number only appears once in each row, column, and small cell.
At the beginning of the game, some squares will be pre filled with numbers as prompts, and players need to infer and fill in the remaining numbers based on these prompts and the already filled numbers. Sudoku games require logical reasoning and patience, and there are no squares that require guessing.
The difficulty of Attractive Sudoku can be determined based on the initial number and position filled in, and there are different levels of difficulty in Sudoku games such as simple, moderate, and difficult. Sudoku games can not only exercise players' logical reasoning ability, but also improve their focus and patience.