After a recent discussion that I won't link to since it involved several different threads and was partly on discord, I am taking over maintenance of the NeoLemmix versions of official levels.
I have attached a zip of the current levelpacks, in the last version offered by namida. I am designating this
version 0.1.0 going forward.
Please note that, for challenge purposes, this is a work in progress. I
expect that I will only be making cosmetic changes that won't affect gameplay much, if at all. However, if using these levels for challenges, be aware that at the moment, I consider the packs to be a work in progress, and future changes may possibly invalidate results. When I consider the packs to be finished, I'll show that by moving the version number to 1.0.0.
Changes I definitely intend to make:
* Restoring the decorative terrain to "Call in the bomb squad" and "Save Me" (and maybe other levels, but these two stand out);
* Adding WillLem's conversions of the special graphics entrances/exits to the special graphics levels;
* Adding other official levels, where NL conversions exist (L2 Classic tribe, and NES/ZX Spectrum levels);
* Splitting the "Extra Levels" pack into separate packs for 2P, Genesis, PSP, and others.
I will also look through the packs to see if there are other changes that I feel need to be made, or changes namida has made that I disagree with

If there are, I'll post about any changes I intend to make so that the community can give feedback.