76. Nine Nines Puzzle This array of 9 nines contains 8 straight lines, each totaling 27 (3 across, 3 down, 2 diagonal). Show how to move 4 nines to new positions to make 10 straight lines, each totaling 27. Added 16 February 2011 · Updated 8 July 2026 Show Solution Solution: Original: New: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 So the four moves are: top-left moves left top-right moves right bottom-left moves left bottom-right moves right The 10 lines of three 9s are: 3 horizontal rows 1 vertical center line 2 long diagonals 4 shorter diagonals
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