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2019-06-10 21:04 Arno  
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purely logical puzzle; enjoy! :-)

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2019-06-12 15:55 Donald  
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Nice one  Arno .  
It took me a while of scribbling on a paper to figure this one out.

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2019-06-12 18:10 Arno  
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WELL done and thx for playing  Donald !   
As expected, this cave has Multiple solutions; i'll show mine tomorrow. :-)

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2019-06-13 19:44 Arno  
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the author's solution is free now!  
  
and there's a new cave 'skyscraper' based on a similar idea! :-)