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2021-11-15 11:21 nesdori  
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no need for level 3, i think :)

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2021-11-15 11:50 dustin  
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if the siamese twins work harder than on level 1 in your solution, i guess you're right ;)

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2021-11-15 12:55 nesdori  
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 dustin , well they are working more on the edge this time but luckily they know their cso :)

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2021-11-15 18:57 dustin  
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hehe :d

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2021-11-17 12:43 dustin  
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my run free! this firefly pattern occurs in classic caves from time to time, this gave me the idea :d  
  
 nesdori , i guess your miss-by-1-frame-strategy was the following:  
  
you trapped the fireflies completely (as in your solution of the previous version), then you switched to the right side via the bottom (pushing the bottom | to the very right and the right gwall blocked your way back) and then you tried to release the flies from right and immediately try to switch to the left side again, hoping to be quicker than the vertical gwall. but cso does not allow that!  
  
other "strategic traps", i.e. plausible idea which do not work:  
  
| one might wonder why in the strategy mentioned above, ^ switches to the right only to try to switch back to the left again. why not just release the immobile flies from the left? that's because their relative facing directions are such that the bottom fly will always be crushed by the | if ^ releases the top firefly.  
  
| why does ^ have to rely on fireflies to hold the | at all? can't he just release the right fireflies, then push the bottom | left, convert the top | and proceed from there? no, this does not work either. the combination of |\ at the bottom line will always be in ^'s way!

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2021-11-17 13:54 nesdori  
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 dustin , yes that's exactly was my first idea but ^ missed it by one frame. but.. if the flies aren't completely trapped also the right side release work as my solution shows. i was actually so excited when i realized the trap can also be bigger that i tried the right side strategy first and i didn't realize the simpler intended left-side method :D

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2021-11-17 14:03 nesdori  
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hmm.. i should have done level 3 remix before revealing my solution  where the exit is located on the left side and not at the center :)

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2021-11-17 16:25 dustin  
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i'm happy to read that the 201st cso cave can still make players excited! :d  
  
yeah that would be a cool level 3 idea ;)