Moreover grayed cells can only contain numbers from the given series. Numbers in the series follow some particular pattern. All the numbers of the series will be given. While solving the Sudoku ignore the repetitions of numbers in the series (if any).
https://www.funwithpuzzles.com/2010/07/series-sudoku-ss2.html
Moreover grayed cells can only contain numbers from the given series. Numbers in the series follow some particular pattern. All the numbers of the series will be given. While solving the Sudoku ignore the repetitions of numbers in the series (if any).