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The Mini Book of Logic Puzzles - Killer Sudoku 200 Hard (Volume 10)
The Mini Book of Logic Puzzles - Killer Sudoku 200 Hard (Volume 10)
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, sub-regions have specified sums, and no number can be repeated within a region. This variant also called "Sums Sudoku", "Sums Number Place", "Samunamupure", "Kikagaku Nampure".