Windoku (Daily Sudoku League #117)

My last Sudoku puzzle for Daily Sudoku League Odd-Even View Sudoku (Daily Sudoku League #116) which I posted for the practice of India Sudoku Championship 2015 was quite tough. So let me post an easy puzzle for this week which is Windoku. This Sudoku type is also appearing in Junior World Sudoku Championship 2015. Hope this puzzle will be good practice for junior players who are going to participate in this championship.
I am posting this Windoku, as 117th Sudoku in Daily Sudoku League. Can you solve this hard Windoku puzzle?
Rules of Windoku
Classic Sudoku Rules apply.  Additionally, four extra shaded regions contain the digits 1 through 9.
Windoku (Daily Sudoku League #117)
Windoku (Daily Sudoku League #117)


Next Daily Sudoku League Puzzle: Overlapping Sudoku (Daily Sudoku League #118)

Solution of Fun With Sudoku Series Puzzle Disjoint Groups Sudoku (Fun With Sudoku #69)
Disjoint Groups Sudoku (Fun With Sudoku #69) Solution
Disjoint Groups Sudoku (Fun With Sudoku #69) Solution


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