Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg/250px-Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg.png
100% puzzle
Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg/250px-Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg.png