• Joe Tramp
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    Two possible solutions - fill in R4/c4, then it´s completely logical (although very difficult).
    January 31, 2016, 6:40 pm
  • tsir1962
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    Even with the given hint, I don't thing it's logical. More guessing needed.
    February 1, 2016, 2:14 pm
  • Sena10
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    Hard, bur guessable!
    April 20, 2018, 6:49 pm
  • russs
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    No chance to solve it.
    November 11, 2018, 7:23 pm
  • Max Krist
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    The "Wrench" is top left to bottom right, in each of the opposite corners there are 2 allen wrenches and then there is a "T" in the top middle and a hollow square in the bottom middle, both are slightly off centre. I Hope that helps anyone still struggling without giving away every position.
    October 16, 2019, 5:07 pm