OK. I've compiled all the levels in a spreadsheet so here are some results I've found.
In terms of new NeoLemmix objects my spreadsheet shows so far that there are no levels that include One-Way Fields, Radiation, Splat and Anti-Splat pads or Single use traps. (Although the latter two are only available in the Wasteland graphic set, it would be nice if we could use them in other sets, or even better, if namida decides to release the honeycomb set early so that we can make use of that trap better) Also, I only see the Slowfreeze in one of Dullstar's tutorial levels and nowhere else. The Updraft and Splitter are also only seen once - in 'The Copenhagen Interpretation' and 'Lemming of the Century' respectively.
I'd just like to mention that I'm not surprised radiation and slowfreeze aren't used much. I had a lot of trouble coming up with a tutorial level for slowfreeze and I'm not completely satisfied with the result. I might try again at it later; and I still need to do radiation. I'd honestly forgotten about Splat/Anti-Splat pads and Single Use Traps since most of the tilesets I've used don't have them at all.
I'm surprised updrafts are only seen in one level though, but I'll fix that - I never specified whether or not Lem-17 Bomber from
an earlier level design contest can be used for this, and that level uses updrafts, so that should solve that problem. I'll get on a tutorial level for them right now.
EDIT: Here's a picture of Lem-17 Bomber
In terms of skills the disarmer skill is only used once - also in a tutorial level - and nowhere else. The Stoners and Stackers aren't too far ahead, although understandably, the mask images of both skills are quite similar.
...
Still, it would be nice if somebody can put these objects and the disarmer skill in at least one level before we compile the pack together. I'm going to try and re-release one of my contest levels with the radiation object, as long as its in a graphic set that has water.
I'll see if I can do anything with the disarmer as well, but I'm not so sure about that.
By the way, earlier in this thread I released a level called Test Chamber. I never got any replays back for whatever the latest version of it was so I don't know if it has any backroutes (or if anyone's even found the intended solution!) or not. It is attached, along with some other stuff, to
this post.
EDIT: The version of Test Chamber in the dropbox doesn't seem to be labelled v4, but is in fact the correct version. Also, picture!
EDIT TO AVOID DOUBLE POST:
Completed an Updraft Tutorial Level!
If you can't play it, you've got outdated versions of the Genesis tilesets. They
should autodownload but I'm not sure what happens if you have already have an older, incompatible version of the set. I needed it because those sets have updrafts in them; the normal versions of the sets, except fire, do not - and I didn't want to use the fire set for this level.
EDIT 2: It would help if I actually attached the level. Added a picture of it while I'm at it.