HARD Sudoku Puzzles H31-H40

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 H31	Hard Sudoku Puzzle H32
Hard Sudoku Puzzle H33	Hard Sudoku Puzzle H34
Hard Sudoku Puzzle H35	Hard Sudoku Puzzle H36
Hard Sudoku Puzzle H37	Hard Sudoku Puzzle H38
Hard Sudoku Puzzle H39	Hard Sudoku Puzzle H40

Solutions for above 10 Hard sudoku puzzles H31 to H40 can be found Here.