Sudoku 9×9 Medium — Set 21By skyseed_admin / April 9, 2026 medium 9×9 Set 21 Complete the sudoku grid (6x6): each row, column, and box must contain each digit exactly once. Grid: [_ 2 _ 1 | 1 _ 2 _ | 2 _ _ 3 | _ _ 4 2] Check Answers Reveal Solution Reset