No need for a pen or pencil, Sudoku is officially online! Click a number followed by an empty box to place it. Fill the entire grid 1-9 on each row, column, and 3x3 square with no repeating numbers to win. Are your Sudoku skills strong enough? Sudoku, online Sudoku, free Sudoku, play Sudoku, Sudoku puzzle, brain training, logic puzzle, number puzzle, mental exercise, concentration, memory, problem solving, online game, mobile Sudoku, easy Sudoku, difficult Sudoku, 1-9, no duplicates, row, column, square