HARD Sudoku Puzzles H71-H80

Objective:

Fill in the 9×9 grid so that each row, column, and 3×3 subgrid contains all of the numbers from 1 to 9, without any repetition.

Rules:

Each row must contain all the numbers from 1 to 9 without repetition.
Each column must contain all the numbers from 1 to 9 without repetition.
Each 3×3 subgrid (box) must contain all the numbers from 1 to 9 without repetition.

Hard Sudoku Puzzle H71	Hard Sudoku Puzzle H72
Hard Sudoku Puzzle H73	Hard Sudoku Puzzle H74
Hard Sudoku Puzzle H75	Hard Sudoku Puzzle H76
Hard Sudoku Puzzle H77	Hard Sudoku Puzzle H78
Hard Sudoku Puzzle H79	Hard Sudoku Puzzle H80

Solutions for above 10 Hard sudoku puzzles H71 to H80 can be found Here.