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2019-05-22 20:45 Arno  
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i got another idea, see my demo. :-)  
  
also this method needs luck with boulder pushing, therefore i've made a clone with one light boulder.  
  
is this the intended solution? i guess not, since i do not use all flies...

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2019-05-22 20:55 nesdori  
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nice solution and upper part sequence! i missed that this is possible. it's not the intended solution. i knew that with butterfly there is possibility for short cuts, there are so many ways to use it :)

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2019-05-22 20:59 shredder  
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nice idea! way different solution than mine :)

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2019-05-22 21:57 Arno  
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wow real horror; i thought that smuggling a butterfly through the wall like this wasn't possible... amazing run \ thanks  nesdori !  
and i have an idea for a next cave.... :-)

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2019-05-22 23:41 shredder  
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just like i wrote in original version, i can't wait for youre next cave  Arno  :-)

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2019-05-22 23:52 nesdori  
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 Arno  has probably already finished his new cave and now he is thinking about what would be horrific enough name for it :)

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2019-05-23 17:49 shredder  
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i think that i found another curiosity ;) i've tried  nesdori 's strategy, but with smuggling butterfly without even touching the growing wall. btw, i feel so f* dumb, after wrote that is impossible :( ;-)

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2019-05-23 18:29 nesdori  
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 shredder , whoa! i had to use frame-by-frame demo feature to see what just happened! it seems that horror story has just begun. i wonder what will next caves introduce.. :-O

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2019-05-23 19:10 shredder  
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i've did it the same. i've just watched the demo with f-b-f tool. conclusion is that the falling boulders/diamonds, passing flies etc. have priority over the wall expanding from the left to the right side.  
  
but wall expanding from the right to the left is brutal and take the priority hard. thats why setting only the rockford between g-wall is not enough to let the flies go through. wall at the right side of rockford just close the door in front of passing fly and even wall at the left side of our hero.  
  
 nesdori , do you have another idea to continue the fantastic horror pro series? ;)

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2019-05-23 20:22 nesdori  
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boulder dash engine scans a cave from up to bottom and left to right. that's why extending wall which is extending to left seems "aggressive". anything that is right to it and moves away is instantly replaced by a wall because wall object is scanned right after the object which is located left from it. Extending wall extending to right is tame for same reason. The wall gets scanned first and the object blocking it after it. Blocking object moves away and if there's another falling object straight above it, it has time to fall and block the wall again. that's why a stream of falling boulders block a wall extending to right but wall extending to left will interrupt the stream right after the first boulder moves away.

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2019-05-23 20:59 shredder  
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thank you for great explaining :-)