Sudoku is one of the most popular logic puzzles. Japan promoted it globally. Sudoku players must fill a 9-by-9 grid with numbers from 1 to 9 in each row, column, and 3×3 section. One of the best brain games, it requires logic and patience. Sudoku enhances focus and mental agility without requiring advanced arithmetic skills. Sudoku regularly improves concentration and intellectual flexibility. Adults and students can play Sudoku online for free to improve their thinking and have fun.