Tenner Grid [10ER-2-007P]
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1000 Math Logic Puzzles – Collection II
US, CA; UK, DE, FR, ES, IT, other
Puzzles in this book: Calcudoku, Sudoku XV, Vudoku, Mathrax, Sandwich Sudoku, Killer Sudoku, Terra X, Little Unique Killer Sudoku, Frame Sudoku, and Sum Skyscrapers.