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Quad Sum Sudoku (Daily Sudoku League #35)
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Sudoku Mania: Quad Sum Sudoku 2013 - 1
X Sums Sudoku
X-Sums Sudoku (Daily Sudoku League #154)
![Magic Sum | Sudoku [revised] - YouTube](https://i.ytimg.com/vi/77BhwINBs4s/mqdefault.jpg "Magic Sum | Sudoku [revised] - YouTube")
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Sum Sudoku | Perplexible
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Killer Sudoku. First one in a while I can't even find a starting point. : r/puzzles
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258 Sum Sudoku Puzzles (FWS #318, DSL #218)
Conceptis Sum Sudoku – Torstar Syndication Services
Groupsum Sudoku - puzzlephil
