The object of Sudoku is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 grids contain all of the digits from 1 to 9. The puzzle starts with some cells already filled in; your job is to use logic to fill in the remaining squares. No guesswork needed—just pure deductive reasoning. Whether you're a beginner or a seasoned pro, Sudoku offers endless challenges that sharpen your mind and make for a perfect brain workout.