Sudoku - Classic Sudoku Puzzle

Choose a difficulty and start a new puzzle or a daily challenge. Tap a cell and enter a number 1-9, ensuring each row, column, and 3x3 box contains all digits without repeats. Use notes to mark candidate numbers and clear them as you confirm answers. Toggle hints, error checking, and the timer to match your preferred challenge level. Undo or redo moves freely to test ideas without losing progress, then complete the grid to win. Join quick competitive rounds or chase leaderboards by finishing puzzles faster and with fewer mistakes.