International Sudoku Day has always been observed annually on September 9.
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When is International Sudoku Day?
- International Sudoku Day 2017 is observed on Saturday, September 9, 2017
- International Sudoku Day 2018 is observed on Sunday, September 9, 2018
- International Sudoku Day 2019 is observed on Monday, September 9, 2019
- International Sudoku Day 2020 is observed on Wednesday, September 9, 2020
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