Calm 18 -
Tick-Tock Lemmings Nice radiation introduction level!

These objects I didn't mind at all, and seeing them again after so long kind of got me missing them

Calm 19 -
A chilling breeze Introduces the slowfreeze object, which is very similar to radiation, except it turns the lemming into a stoner instead of a bomber after the countdown finishes. This one is also a bit harder than the previous level, although not by much. Here, it's absolutely critical that as soon as the lemming gets into the second pit on either side that they bash once they're facing the right direction, as otherwise they won't stone in the right place to get everyone down safely.
Perky 5 -
Two for the price of one Nice and short radiation level, I especially love the trick of cloning a lemming that got the countdown after building to reach the radiation
Perky 20 -
Super Mecha Death Gators For such a simple looking level with a very minimal skillset, very hard level and the one that I was stuck on the longest out of any other level in the pack. By this, I was stuck here for several months. For very good reason, as the traps are 3-in-1, one of which is the very fast chameleon trap from the Rock tileset of ONML. I thought the solution would be very fiddly and relied so much on luck, but it actually turns out I simply went about the level the wrong way. Instead, it's much simpler than I thought, which requires compressing the crowd between the builder wall and blocker. The rest will follow from that. Very nice level, and was satisfying to have figured out and solved on my own

Perky 21 -
Tailor made for someone Nice special graphics level. Very easy one to boot after the previous one which is quite hard.
Twitchy 6 -
Do you feel a draft? Nice slowfreeze puzzle which can be somewhat tricky, but here I used repeated cancelling of a platformer so that the stoners would be in the right place

Hyper 3 -
Thou dost ask too much! Unlike the New Formats version, this one uses the radiation object. Very nice trick of blocking right next to it so that lemmings from either side don't trigger it and receive a countdown. The rest of the solution is the same as the New Formats version, except that you also have to wait for the preplaced lemming to turn back to the left and then you can release the blocker with a walker.
Troll 4 -
Hey you, stop that Same as the New Formats version, except this one seems harder on Old Formats. The solution is very different, as the lemmings don't start bunching up behind one another until after more time has passed. Other than this, I pretty much used the same solution. Once again, I still don't see the trolling element of the level
