Wow. An underwhelming response if ever there was one, but OK...
this accommodates levels where the entrance is to the right of the exit
The version of the challenge I'm suggesting
is different then, and more levels are likely to be impossible. Since the challenge is being done in NL, though, which allows entrances facing either way, it's feasible to flip the entrances for those levels if we allow that as a rule.
A much more restrictive version of a pass/fail challenge that already had a lot of impossible levels, since it requires the exit to be above the entrance, which is actually quite rare. I can't see this getting off the ground.
It's likely that only a handful of levels are possible, but I think it will be fun to find out which.
NL doesn't record time taken if no lemmings are saved, but "fewest skills to kill all lemmings" seems viable. Not sure how interesting it will be, though; I predict a lot of 0s and 1s.
Coupled with what namida was saying about simplifying the challenges, fewest skills seems the best way to go with this one then, forget fastest time.
How many levels can be beaten with only one type of skill? for DOS Lemmings; for NL this doesn't have its own topic but is considered as part of Fewest different kinds of skills
Fair enough, although my version allows editing the level where necessary (as namida pointed out).
(re:Just Keep Swimming)
Too vague to be a workable challenge; this is more of a level design game.
Fair enough, I might suggest this one as a level design contest at some point in the future then.
Regarding the challenges that already have topics: NeoLemmix has evolved
massively since a lot of these challenges originally began, and both
Redux and the "NL official" orig/ohno packs have yet to be finalised. I think it would be fun and worthwhile to generate an up-to-date list of results which specifically work in NeoLemmix.
I also think it's worth looking at allowing use of NeoLemmix's various capabilities in terms of editing levels, changing up skillsets, exploring the new skills, etc, to create
new challenges that are unique to NeoLemmix, like namida is doing with the "Save-'em-Up" contest.
Having said that, since I do tend to suggest quite experimental and/or niche challenges, I would be happy to compile them all into a single topic simply called "WillLem's Challenges" or something, if your concern is that the challenges board will be overrun with wierd and wonderful ideas that nobody shows any interest in but me and maybe a couple of other people. The Builders & Bashers Only challenge didn't really take off like I'd hoped, although one or two people have joined in and shared results, so there clearly is an audience.
In response to namida's comments; I realise that
I do need to define the rules for challenges more clearly and simplify them as much as possible rather than try to combine elements, so I'll aim for simplicity in future. Also, it's fine for a challenge to only have a small handful of levels that are possible within the defined parameters -
I'm OK with levels being a "No" for a challenge; Builders & Bashers has lots of impossible levels, for example. The interesting part is discovering which levels are possible and which aren't, and documenting your findings for people to then improve on if they wish.