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2022-12-07 19:03 Arno  
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nice cave. :-)   
i remember several hourglass-themed caves have been published here in the past. I've tried to find all of them and here are those which i found:  
  
Π 'hourglass' by  krissz   
Π 'time' by  lemming   
Π 'time of your life' by me  
Π 'cso 222 evil hourglass' by  dustin   
Π ... and this cave.

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2022-12-07 21:52 dustin  
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very hard but cool strategic puzzle!

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2022-12-07 23:57 DarkStoorM  
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THERE WAS ONE WITH A SLIME IN THE MIDDLE AND OPEN BORDERS, BUT ALSO CAN'T FIND IT, it was probably from  trischi , I THINK IT COUNTS TOO :D

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2022-12-08 00:09 dustin  
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 darkstoorm , your description fits with my cso cave mentioned by  Arno  below, but probably you mean another cave? :d  
  
wow, you two were about ten minutes (!) quicker :d i did take a lot of time pushing ΒΒΒ, but at least it worked after my first strategies clearly failed :d

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2022-12-08 09:42 DarkStoorM  
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 dustin , no no, the slime was in the middle of the cave :D I will try to find it later

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2022-12-08 10:50 DarkStoorM  
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Ahh! It's called Mini Cave 2 from   chris  neilson  :D  not sure if it fits the hourglass theme though :D

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2022-12-08 12:55 altermaven  
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There is a full-wrap version that caused a pseudo-infinite cascade if unplugged, that would be stripes dx 22 aka "klein hourglass" (in reference to the klein bottle, which is essentially a three-dimensional version of a moebius strip).

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2022-12-08 20:36 Arno  
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another one is: " dustin 's bd6 cave f l5" :-)