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2017-06-06 01:02 trischi83  
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for experts!  
  
:-)

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2017-06-06 19:00 Arno  
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either:   
push a boulder through the air. (much luck)  
  
or:  
push a boulder on the explosion of the second firefly, and crush the third firefly with it. (less luck but much timing)

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2017-06-06 22:10 trischi83  
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 Arno ,  
  
your first theory is not possible,  
   
because you can´t boulder-spped air-pushing from the right side to the left side (only possible from the left to the right side).  
  
your second theory is absolutely right!  
  
another ways are not possible! :-)

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2017-06-07 07:54 Arno  
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thanks  trischi ! :-)  
  
keep it open, good youtube stuff! ;-)

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2017-06-07 10:16 Piter  
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great great cave :-)

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2017-06-07 12:57 trischi83  
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thx friends! :-)