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2022-06-21 22:20 DarkStoorM  
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OK, now that is just pure evil :D :D :D

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2022-06-21 22:21 dustin  
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i wanted to find out how many fireflies are strictly needed on each level of bd1-l. my result is: it's exactly two fireflies on each level!  
  
that two flies are enough on each level is fairly simple. only l5 is a little bit tricky.  
  
the more interesting question was whether one firefly might be enough on a certain level:  
  
\ on level 1, 3 and 5 i think it's easy to see that one fly isn't enough. on each of these levels, there are two seperate spots to break into, and these two spots either aren't close enough or the only spot where one firefly could blast into both places is blocked by a |.  
  
\ level 2 (this cave here) is close. there's one diamond which i can a l m o s t get without an explosion. it works only with the open border, changing the cavescan order at one decisive spot!  
  
\ level 4 is also interesting. there's only one diamond hidden behind walls, and it might be possible to get it with one firefly by blasting the right wall from the starting room. it's close but i couldn't do it (even with light boulders, representing infinite pushing luck).  
  
so again my final result: on each level of bd1-l, two firefly explosions are necessary, but no more.  
  
difficulty of the cave: 8/10

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2022-06-21 22:34 dustin  
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 darkstoorm , but you beat the evil quite quickly :d

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2022-06-22 10:29 DarkStoorM  
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 dustin : Well, yes, but only because I saw how the boulder "teleported" diagonally ;) a happy accident :D

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2022-06-22 16:33 dustin  
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 darkstoorm , your description sounds very interesting! i wonder whether you found a different solution than i :d

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2022-06-22 19:06 DarkStoorM  
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 dustin , the hint for me was snapping the dirt next to that tricky \  
  
I thought it was moving twice (left-down), but I realized it was different. With a stack of two |, the bottom one moves first, because it's in the first row, then the top one takes its place in the same frame  
  
.I.!.II.!.II.! second frame: bottom | goes Left  
...!....!....! Also second frame: Top \ goes down  
.|.!..|.!....! because it still has not been scanned  
.|.!.|..!.||.!  
.\.!..\.!..\.!  
  
This situation alone made me think that just one firefly has to be used somehow to get that \, but without crushing, so I just went in for the \, making the firefly follow me :D  
  
So in the end I think we have the same solution :D

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2022-06-22 23:10 dustin  
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 darkstoorm , ahhhh ok! yeah, sounds like same solution now :d

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2022-06-24 22:31 dustin  
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my solution free! ^ touches the ffly from below for one frame, which is usually not possible, that's why the open border is there to reverse the cavescan order :)