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The objective is to fill the grid with numbers from 1 to 16, ensuring that each number appears exactly once in each row, column, and 4x4 subgrid. hard sudoku 6 x 6 sudoku Over the years, puzzle designers have created various levels of difficulty, ranging from easy to expert. sum sudoku online When faced with a dead end, try inserting a number into a square and see if it leads to a contradiction. 6 x 6 sudoku These apps often offer a variety of puzzle types and difficulty levels, catering to different skill levels.