Daily League Sudoku #11: Windoku

This week a Windoku. It will probably be one of the easiest puzzles I have made for the league. I like Windoku puzzles. I always prefer the puzzles that don't have any clues in the 4 extra windows. I had actually written this puzzle a while back, but I haven't used or posted it anywhere. As I like how it looks and solves, I'm using it for the league. I hope you enjoy it too.

Recap of last week:
Sunday's Little Addition or Multiplication Killer Sudoku by Seungjae Kwak
Monday's Knightly Non-Consecutive Sudoku by Fred Stalder
Tuesday's Disjoint Groups Sudoku by Prasanna Seshadri
Wednesday's Extra Regions with Mirrored Cells Sudoku by Bastien Vial-Jaime
Thursday's Diagonally Non-Consecutive Sudoku by Rishi Puri
Friday's Classic Sudoku by Tom Collyer

Sudoku Pdf:
Week 11

Rules for Sudoku

In this Sudoku, you also have to place digits 1~9 once in every grey 3x3 square.