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2018-12-15 15:18 Arno  
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tested - puzzle cave! :-)

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2018-12-15 17:13 krissz  
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Fantastic cave!

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2018-12-15 17:35 Arno  
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thx! who solves it? ;-)

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2018-12-15 20:24 krissz  
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I have two totally different solutions!  
  
I'm curious which one is your intended solution.

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2018-12-15 22:06 Arno  
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this is the intended solution.  
  
i guess you've found a shortcut.... :-O :-)

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2018-12-15 22:22 krissz  
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You can see now my solutions.  
  
I get The highest score with your method: kill fireflies at the same time. But I built a totally different maze than you.  
  
The another method: build a much longer way to the left firefly and after you kill the right one you can easily close the left one.

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2018-12-15 22:44 Arno  
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i expected multiple solutions are possible, but overlooked your second way (trappig the left fly). well spotted! :-)