Sudoku - Your attention. Killer sudoku puzzle 9x9, hard level, #460 Killer Sudoku 9x9 (Sum-do-ku, Sums Number Place, Kikagaku Nampure, Sums Sudoku, Samunamupure) divided by a smaller square of 3x3 cells. The
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File:The first discovered minimal 9x9 Sudoku puzzle with 40 givens.png - Wikimedia Commons