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Zones Sudoku (968)
Instruction:
Apply classic sudoku rules. Digits in the top-left corner of a marked cage must all appear in the cage. Digits may repeat in cages.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2020 - Round 8
(155)
Parent puzzle:
Killer Sudoku
Child puzzles:
Liar Zones Sudoku
Somewhere Sudoku
Related puzzles:
Quadruple Sudoku