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2018-12-16 15:28 Arno  
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tested - another puzzle! :-)

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2018-12-17 17:36 krissz  
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Is This really solvable? I found two boulders around the bottom left side of the matrix which I do not know what to do with it.

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2018-12-17 18:59 Arno  
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yes, it's possible! :-)  
  
i'll hide my solution yet for one day.  
  
(although you probably have access to all solutions anyway) ;-)

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2018-12-17 20:23 krissz  
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i gave up... :(

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2018-12-18 12:44 Arno  
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solution is free now! :-)

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2018-12-18 13:46 krissz  
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I did almost what you did. Only few steps difference but it was enough to confuse me.