Play the classic number puzzle game Sudoku online for free! Choose from Easy, Medium, or Expert difficulty levels. Features an intelligent puzzle generator that creates boards with unique solutions, pencil marks for note-taking, mistake tracking (max 3 errors), hint system, timer, and keyboard/arrow key navigation. The game tracks your best times per difficulty level in local storage. Includes sound effects, touch and mouse support, and automatic win detection when the grid is correctly completed.