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  • $\begingroup$ rotationally symmetric how, just the center square stops it from being symmetric $\endgroup$
    – ratchet freak
    Commented May 16, 2014 at 14:11
  • 1
    $\begingroup$ The center square is symmetrical with itself. $\endgroup$
    – user88
    Commented May 16, 2014 at 14:12
  • $\begingroup$ then it isn't a valid sudoku, all 9 digits must occur exactly once, any symmetry (besides 360°) would require a number to occur twice $\endgroup$
    – ratchet freak
    Commented May 16, 2014 at 14:13
  • $\begingroup$ By rotationally symmetrical, I mean the positions of the clues can be rotated 180 degrees and will overlap itself perfectly. $\endgroup$
    – user88
    Commented May 16, 2014 at 14:15
  • 1
    $\begingroup$ @ratchetfreak why do you think the center can't be symmetric? Like Joe said, it is trivially symmetric. $\endgroup$
    – Kevin
    Commented May 16, 2014 at 14:59