I'm not entirely content with the last level of LOA - I wish I could have provided an equal number of all skills, but nobody so far has managed to solve it with just 10 Builders (myself included). So it's 15 Builders as opposed to 10 of everything else. But the nice thing about it is that it is otherwise a 10-of-everything level with the new "10 classic skills" (classic 8 + Jumper and Shimmier). I hope this new "tradition" catches on! I must admit I'm a little tired of packs that artificially restrict themselves to the classic 8 across the entire list of levels, now that we have so many more skills. Except of course if those packs were created before the other skills were available, like NepsterLems. Then they get a free pass from me.

01: Close to intended. As long as you compress the lemmings somewhere, I'm fine with that. The ketchup and mustard bottles aren't traps by default. It's just my evil genius that turned them into traps. Usually, only animals are deadly in my levels... but as you've seen from the occasional lightning bolt that can hit a lemming out of a thunder cloud (e.g. on "Lems in the sky with diamonds"), it's not entirely restricted to that.

02: That is a slight backroute, but a clever one. Maybe I can fix it, maybe not. I don't want to go all out on pickup skills on this particular level, since that's what Flopsy's second level, "Read my lips", is for.

03: Open-ended. This isn't based on any actual level by Proxima; it's based on his own verbal description of his level building style. Funnily enough though, as you can see from the past pages of this thread, he nevertheless was the very first one to identify his own level.

04: Intended. If you watch any Let's Play by Colorful Arty, you immediately know this level is his.

05: This level is a gift that keeps on giving with regard to backroutes. A little steel should fix this particular one, though.

06: That solution was much more complicated than the intended one, because you had the worker lemming loop around quite a few times. Still, you used all the skills, so that's fine by me! Now I can understand though why that crackle sound was annoying you the whole time, because the level took much longer with your solution. FYI, the New-Formats version doesn't have this object anymore, since it's technically an animation with no effect. And probably also because it disguises as terrain, and is therefore similarly dishonest as a hidden trap. I think namida has plans of reintroducing no-effect triggered objects, but that still doesn't mean this particular "trap" will return.

07: Intended. Just like IchoTolot's solution. Glad this approach seems to be sufficiently enforced on this level.

08: Open-ended. This is one of the levels not made in-style of IchoTolot, but a level type that IchoTolot hates (like a Hard-for-Flopsy level for Flopsy). That's why, in contrast to Groupie 03, I made the chambers interact with each other via the teleporters, as a compromise.

09: Valid alternative solution, includes the main trick.

10: Open-ended.

11: Well, that's one way to do it. As long as you use compression method and the chain staircase at the end, the level has fulfilled its minimum requirements.

12: Very nice and elegant! Btw, if this had been supposed to be GigaLem's level, I would have used his updated version of the Tree tileset. I used the classic one on purpose, because that's the one namida originally made. Also, the title is not misspelled, but written to emulate a New-Zealandic accent. If I had wanted to be particularly infantile about this, I would have called the level "All hands on deck!" instead. Though in the meantime, I've heard that this type of childish humour is actually something namida enjoys himself quite a lot, so maybe that could have been considered another "signature element" of his...

13: Not as bad as IchoTolot's initial backroute, but still too easy, you're right. At least you didn't use the Bomber to create any shortcuts. That gives me hope I might be able to stop this with a few more one-way arrows.

14: Different than intended, but not a backroute per se.

15: Open-ended. You used all the skills except for the last 2 Platformers, this is fine by me.

16: Yes, compressing the lemmings with the Fencers is intended. However, I never knew that it could be done inside the Fencer tunnel itself! I always compressed them while still on that flat surface of the wooden platform right under the hatch, and only once they had been compressed did I send them up by fencing through the stack. I guess I didn't think about this possibility because Arty originally did this with Bashers, and with those, in-tunnel compression won't work, because the tunnels are wider.

17: Intended. The SubLems level in question is "I am R.T." (pronounced like "Arty"), which is Arty's take on the Sunsoft-rank original Lemmings level "I am A.T.".

18: Valid alternative solution. I've come to accept that this level does too many things at once to specifically enforce the trick it's hinting at. But as you said, you used all the skills, and if it still worked for you to recognise this level als Pieuw's, that's all that matters!

19: Well, as simple as that was, it still required most of the skills. Maybe I can prevent it specifically by putting a small piece of steel right under the cross you used to have the Zombies walk over the Digger shaft. But if it's still possible to just dig anywhere else after that, this one might be difficult to fix.

20: Open-ended. And as you can see, no ketchup or mustard traps here!