Trick or Treat 1 -
Night Shift Nice level to start off the pack, though I was surprised by how such a level manages to be challenging despite the very minimal skillset. I pointed it out at some point in the LP, but perhaps a secondary animation for the grabbing hand trap is needed so that anyone can easily make out that it's a trap. The trigger can easily be mistaken for harmless similar looking terrain. However, I do understand that it's a hand that pops out from underground to grab and kill a lemming, but I think for the most part the NL community would appreciate a secondary animation just so one doesn't have to rely on CPM to know for sure it's a trap, as it would ruin the aesthetics when playing with it on.
Trick or Treat 2 -
Let's fire it up! Way too fiddly for my liking, though the concept is nice of each lemming can only be assigned a builder a maximum of 1 time only. However, there is the annoyance of being able to get the timing and spacing correct in order to bash through before anyone turns around. I'm definitely curious of your solution to this level if you have a replay.
Trick or Treat 3 -
Enter The Mansion Nice breather level after the first two difficult levels, where the solutions are obvious but the execution is the main challenge. Here, that's not the case, as you don't need to rely on timing if you don't want to, as I'm certain that's what the blocker and walker are for. However, for a challenge solve the level without using either one. It's definitely possible with the right timing and assigning the correct lemmings the skills.
Trick or Treat 4 -
Road of the pumpkins Nice ceiling solution! This definitely reminds me of a level or two from LWT with a similar concept of going over the top instead of through the bottom because there just isn't enough skills to do so. The only hard part is figuring out where to build to reach the ceiling, but I think it has to be a bit past the tombstone.
Trick or Treat 5 -
Taking the wrong turn Not a hard level, but the entire level is dependent on how the miner is placed. I had the misconception that the lemmings would fall before the wall instead of being to land in it to proceed further to the right. I think it's easy for any person to think the former, as many placements would allow that to happen, instead of the 1, possibly even 2, critical pixels that need to be found in order to allow the others to land in the tunnel. Also the other hard part is figuring out which exit is impossible to go for.
Trick or Treat 6 -
Level under construction Somewhat hard but this one wasn't too bad. I think I made the level a bit harder than I needed to, as I relied on the builders finishing the gap on time before one of the workers slips through to the water. Instead, I realized after solving that I could had simply made the miner build to hit his head and turn around, giving the lone worker more time to build over the gap with the remaining builders.
Trick or Treat 7 -
The Great Old One The first level of the pack to use Gronkling's Menacing tileset. This one was much harder than I thought. It might seem you have plenty of builders and fencers, but they surprisingly run out very fast. Pretty sure I made my solution harder than it needed to be here, as I used some precise timing in order to get my solution to work. I compared with josh's, and no timing very timing heavy required at all.
Trick or Treat 8 -
Wizard's Tower Nice level, especially with the sense of urgency that you need to rescue the hatch as quickly as possible, as 20 floaters might seem like a lot, but they all ended up being used, at least in my solution. Come to think of it, it might not be possible to solve the level with any remaining. My mistake was using two platformers when only one suffices to stop the others from landing in the water in the pot. Once I realized that, the rest of the level is easy, making your way up with the constructive skills and assigning floaters as necessary.
Trick or Treat 9 -
Attack of the Pumpkin Men Another nice, somewhat hard level. Nice keeping the crowd going with the right entrance, where the builder builds to get over land just in time before the next one slips through and falls into the water. Also made the solution a bit harder than it needed to be, as I could had placed the blocker in a different location so that it doesn't look weird with the blocker field being right on top of the trap trigger. It was also hard to see that the gap on the left needs to be done from the right instead of the other way, as it will leave a gap to the water if you do that rather than seal the gap completely. Finally, it wasn't easy figuring out how to get to the exit, especially with mining to get the left crowd up and then building to the exit trigger.
Trick or Treat 10 -
The Box of Pain Deceivingly hard. It might seem like you have a lot of builders available, but not so when it comes to accounting for how you need to build a long bridge to get over the top and into the maze. This would be considered a bit too builder heavy by the community, but I personally don't mind the occasional one, especially if it's an interesting level. I ran into a lot of problems in trying to conserve the builder as much as possible to ensure I would have enough to get the level solved. I would had ended up with a builder to spare I think, but I had to use the final one to get a bit higher in order for the gliders to land on the steel block at the bottom when bombing through the platformer.
Trick or Treat 11 -
The Catacombs My favorite level in the entirety of the pack!

This definitely had Chip's Challenge vibes for me, in that there's an early level of the game that requires you to go inside force fields areas to collect items in order to access the chips. I think it's called "Elementary," but fans of the game in this community can correct me if I'm wrong. It was a lot of fun figuring and working out the solution here. Very ionic!

Trick or Treat 12 -
Pocket Hell It may be a small level, but it's a deceivingly difficult level. I've stated many times that even small levels can be hard if done correctly, and this level is one such. Here, I used some RR manipulation in order for the second lemming to avoid the firebox trap and be able to land on the platform to bridge the gap before anyone else arrives after turning on the stoner. I initially thought to get up through the far left side, but the problem here is that you would need two stoners, which you can't afford since you can only lose 1, and it's obvious that one needs to be used to turn everyone back to the left, as the lemmings go out in the wrong direction from the hatch. Still a nice, decent challenging level!
Trick or Treat 13 -
Zombie zoup Nothing hard here other than you just need to build over the gaps at the right time so that the lemming doesn't get infected by any zombie falling out of the entrance. Seems that's what the blockers/walkers are for in order to help with that and to reduce the annoyance. Still, great two-lemming breather level!

Trick or Treat 14 -
The Devil's Mark The second level in Gronkling's Menacing tileset which is also a hard one. Seems I overcomplicated the left-most entrance, as that's where I used the digger and bomber, which I consider the two most difficult skills to use in this level. The massive building isn't as bad, but you still need to be careful with them, as they too run out very fast despite how you have a lot provided, 19. This would definitely be considered way too builder heavy for the community, but again I don't mind the occasional one, and it's not like it's being done to death after the second time in the pack. Nice design with the claws.
Trick or Treat 15 -
Night of the living lemmings Hard one but a great level! Not easy due to the 2-of-everything skillset in 6 skill types. This was a fun one to figure out, though it's certainly hard to figure out how to avoid the zombie horde while still doing the other parts of the level. Here, I managed a lose 3 solution, so several over the requirement.
Trick or Treat 16 -
Only one way to hell The final breather of the pack, as this literally took me only about a minute/1.5 minutes to solve

I think I can see the intention of the basher going through the huge wall to the right and would require platforming at two different levels to achieve that.
Trick or Treat 17 -
Roadkill Nice non-trivial stoners only level. It looks hard, but really it's all about observing where the lemmings from each entrance goes via the gaps/cracks in the terrain. The middle entrance will naturally make their way to the exit, so once you realize this it's just a matter of figuring out how to guide the left and right entrances to the exit. I merged the right with the left so that they take the same path. I don't know if there's other ways to solve the level.
Trick or Treat 18 - Very hard level but a really good one! It was certainly not easy to figure out how to avoid the zombies, some of which land on the left side, the rest land on the right side. Nice use of a platformer to stop the zombies on the left, a digger pit the get rid of the ones on the right. To achieve the latter requires blocking the basher midstroke and having one use the staircase to get through to do the pit. After that, the rest will fall into place, although there's still good timing needed to stone in time before anyone slip to the zombie pit on the left. It's also not clear that the lemmings will step up onto the exit platform after platforming, though it seems this is very precise, as you need to platform when you're as high up as possible, which is dependent on where you stone. Certainly hard because it's not easy to figure out how to get up the level given that you only have platformers.
Trick or Treat 19 -
Trick or Treat? I thought this one was going to be hard because I tend to be very bad with using stackers to solve levels, but this wasn't as bad as I thought. I used a stacker staircase to get a climber to go over the top, but watching other solutions turns out I miss the more obvious of just using a bomber to get past the first obstacle. The very limited skillset makes the level difficult, especially with many obstacles in the way to account for, and it's not easy to figure out which route to take. Going over the top with everyone seems very tempting, but I think the solution has to involve going through the bottom.
Trick or Treat 20 -
The Belly of the Beast A very hard level to finish off the pack. This is the only level of the pack that needed more than one video to get solved, but turns out that I was on the right track for the most part, I simply didn't do a part of the solution correctly or take it far enough. Again, compared to other solutions after solving, and I can't believe I missed the obvious bombing to stop anyone else from following the worker. I think it's due to how I didn't think bashing would work if you don't place the basher correctly. Instead, I came up with a more precious solution than it needed to be, as I relied on a miner to get the basher lower so that he doesn't stop due to steel earlier than he should. Then I waited for everyone to collect in the narrow pit after mining and then I started bashing towards the exit, with the lone lemming coming in at a time when he has enough of a distance to build to the exit before anyone gets into danger. Because of this, I went against my custom of normally doing two attempt videos of the same level by working out the level off-camera. Once I found something that works, I saved the replay in case it took me too long to recreate the solution by hand on video. I definitely had doubts squeezing through the narrow space at the top was the intended route, but it seems that it is indeed the intended path, comparing it to the other solutions available after I solved the level on my own without help (I'm one of those players who prefers figuring out levels on my own first before watching replays to compare, therefore I don't ask for hints).