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Extended Extra Regions Sudoku (972)
Instruction:
Apply classic sudoku rules. Each marked 10-cell string must contain all digits from 1 to 9. Digits at both ends of each string must be the same.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2021 - Round 1
(157)
Parent puzzle:
Extra Regions Sudoku