Sudoku is a free puzzle game developed by Cross Field Inc. for Android 9.0 users. It is a classic game that has been enjoyed by millions of people worldwide. The game is played on a 9x9 grid, which is divided into 3x3 sub-grids. The objective of the game is to fill in the empty cells with numbers between 1 and 9, making sure that each number only appears once in each row, column, and sub-grid.

The game starts with some of the cells already filled with numbers, making it more challenging to complete the puzzle. Sudoku has three difficulty levels to choose from, making it suitable for both beginners and experts. With its simple interface and challenging gameplay, Sudoku is a perfect game for those who love puzzles and want to improve their problem-solving skills.