Calm 2 - The Stumbling Block Probably a little too difficult for its position despite only two skills available. I was a dummy here and for some reason a few times tried simply digging with the first Lemming after the basher gets far enough to get past the block at the bottom It's likely possible to be able to have everyone who makes it into the digger pit survive, but I honestly probably gave up trying to fiddle around with that too soon

Calm 5 - Status Quo Nicely designed by your friend but other than the VGASPEC like level nothing too special and very easy.

Calm 6 - Your Egg Is Cracking! Hehe, I like the design of the egg with the exit partially buried in it I'm a bit annoyed that it doesn't seem to be possible to save everyone due to the builder staircase just barely not reaching high enough to stop the splatting on time, but well, it is what it is. I'm just one of those players who likes going for save all's as much as possible, and if that's not possible then saving as much as is possible

Calm 7 - The Lemming Hair Dryer Way too easy. I would definitely swap Calm 2 with either Calm 5 or this one, though it's probably better to swap with the latter, as the halfway point of the rank seems perfect for the VGASPEC level

Calm 8 - Follow Me! Harder than it looks, though that's because for the gaps where the wooden staircases are I kept trying to not use any interrupting skills Even then, the second Lemming catches up quite quickly and hence it's necessary to either delay him with the other skills and/or also have the lead Lemming build across the gaps as quickly as possible while also cutting him off early once he's made it over the other side. Nice level nonetheless!

Calm 9 - Sneaking Out Needed to resolve this one, as one of the early skill assignments comes about a frame too late or so. Phew, nearly ran out of time, I think I was just a frame away from the clock ticking down to 0 seconds

Calm 10 - Break the Cycle I remember the contest version of this level from 5 years ago. Sorry to hear that it needed to be scrapped from the pack I remember it being a nice one despite it being an easy one. This one's easy too, though I think my solution to the contest version might still work here too. I would have to check.       

Tense 3 - Going Down Now this would be a good example of one where it's easier than Calm 2 but still not trivial by any means. Once again, I was a dummy of having the digger face the wrong way when I was doing it on the right side, as after a few attempts I went down the left side. You can actually go down either side, just if you do it on the right make sure the digger is facing the left, not the right! Nice level!

Tense 4 - Operation Hatchling Easier than the original in the previous rank IMO, especially as you have more builders than you actually need this time unlike the last time. Still a nice level here

Tense 6 - Pause and Ponder I haven't tried or checked, but I'm guessing there's a hidden exit on either side. I went for the right exit. Nice challenge to save everyone here, though it's still not too difficult. This one is a bit harder than the VGASPEC level in the previous rank, but still a nice one. Your friend did great.

Tense 7 - Meet in the Middle Nice Cascade concept level. Nice level idea with a glider going over the top to dig and build to the exit to turn and then build from the right side while also having another Lemming build from the left side later on, with some timing needed in order to turn the glider back around towards the exit.

Tense 9 - Risky Business This one I needed to resolve. The leader in my pre-testing replay gets killed by the shredder trap here. Looks like it was a backroute according to what I saw in my replay Just turned around with a bomber this time and I believe the rest is the same.

Panic 1 - Help is on the way! Repeat of Tense 7 and probably a bit easier. The only real difficulty is being quick enough to save the hatch before you lose too many due to splatting, but I think the timing always naturally works out here.

Panic 2 - Lemming-lime soda Wow, nice level! I like how the climber/swimmer needs to come from the other side to get the others out safely. Here, I was a dummy because I thought you needed to go over the green pail as the handle looked like it's too high for the others to step up through Hence I originally tried building and blocking to build the other one, but turns out that's not necessary and hence you can just lose 1

Panic 4 - Freezer Burn Another nice level and concept of having a danger hatch over the steam blower trap of the Ohno Snow graphic set and hence you need to get Lemmings from the other entrance to make safe landing platform for the danger hatch. Even with that, quite an easy level due to the lenient save requirement and plenty of skills available. Probably could squeeze a few more saves in my replay, but meh, couldn't bother myself to go back and tweak it

Panic 6 - Lemming Replacement Therapy Probably just as hard as Calm 2, though the level concept here is nice too. I challenged myself to get the two miners to cancel each other out at the bottom and hence make it a lose 1 solution. I would just keep it a lose 2 level, as this is super fiddly and very precise. As Armani once said of me in his Lemmings Uncharted for a talisman he tributed to me, "don't try this at home if you're not kaywhyn"

Panic 7 - Be the girl you wanna be Nice final special VGASPEC of the pack. Definitely the hardest one of its kind but still a very nice challenge to go for a save all

Panic 9 - A Death-Defying Stunt Like the original, I needed to resolve this repeat as well. I believe it's the same as my pre-testing of the updated version you sent me in that I was able to spare a shimmier here as well. I personally would probably leave some more wiggle room to allow successful shimmying at the start, as it seems quite tight and visually appears like they won't be able to get past the blocker, but that's just me    

I totally agree with you : it makes perfect sense that a shimmier can access a reversed exit like it happens here.
What lead me to think that it was not possible here, is that in CPM the exit trigger appears floating in the air, and not buried in the ground (well, ceiling in this case) like it usually does.
But then again this makes sense with the way the engine works : the feet of the Lemmings (precisely the red star under them visible in CPM) touches the trigger area when shimmiering, so all good !

1) Figure out how to push all those buttons. As I remember from a level in contest 33 by Icho, you have to build some of your own shimmiable ceilings here. Also use the slider correctly.

2) Seeing the strict save requirement of 18/20, and the 2 stoners available, realize that I need to save this button pusher ; save The Chosen One himself !
This was the hardest part for me as all my attempts before that used the single digger elsewhere to either contain/free the crowd or make a way. So I had to spare that digger to save the Chosen One and this is where 3) comes into place.

3) Release the climbers correctly at the beginning to contain/free the crowd correctly w/o using the digger and stacker. This was not that hard actually.

4) Have a heartattack when ready to finally dig-save the Chosen One with the other climber at the end : digging in a diagonal floor leaves that little pixel triangle that prevents climbers from climbing 
Then I spent 15 more minutes trying to find another place to extract the Chosen One from down here, no success. Then I saw this extra stacker and understood the unbelievable combo : stacker + climber + digger = save The Chosen One 

5) Have a last rush of tension when I saw that evil Armani put a flip down there, instead of a boring non climbable wall, so that the Chosen One has a limited amount of survival time before falling to its doom.
Fortunately my digger finished its pit some 20 frames before the Chosen One came back, and they could all go together to the exit. Oh Wow !