File:The first discovered minimal 9x9 Sudoku puzzle with 40 givens.png - Wikimedia Commons
Outside Sudoku Level 2 : Easy Vol. 24: Play Outside Sudoku 9x9 Nine Grid With Solutions Easy Level Volumes 1-40 Sudoku Cross Sums Variation Travel Paper Logic Games Solve Japanese Number Puzzles
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Create 100 sudoku puzzles levels 9x9 with solution 3 option easy medium hard by Aamicano | Fiverr