Assuming that VSI will not be reintroduced in D Lix, some levels should have lix counts reduced (with a corresponding reduction in # to save) so the last phase of play does not run on too long. It's true that the player can fast-forward (or turbo), but the new player may not have found this feature yet, and even if they have, it's an unnecessary annoyance.

Of course, "should" in this case is a hypothetical imperative (i.e. a matter of opinion). So, as I go through the levels, I'll note any that I think should be changed, and suggested values to change to. This is a work in progress, so I'll continually edit this post as I go along.

(Simon has recommended I keep all suggestions for modifying levels together, so some of these issues do not relate directly to VSI.)

Format: xx/yy means "yy lix, require xx saved", not two different suggestions for number of lix.

Simple 1 "Any Way You Want" -- even though the point is to be a very easy level, I feel the extra-large SI is more annoying than useful. I suggest 10 lix, SI 50, require 5 or maybe even 2 or 1. Reduce skills to 10 of each.

Simple 2 "Pipe Dream" -- no change necessary as completing the path takes time, but if S3 is changed this should be too, as it feels odd to have the lix count jump downwards in the early levels. I suggest 10/20.

Simple 3 "Building Block Maze" -- lix still coming out when path is complete. I suggest 16/32. Remove imploders and blockers so builder is the initially selected skill.

Simple 4 "Diamond Dash" -- same, even more so as completing the path takes less time than in S3. I suggest 20/40.

Simple 6 "Every Lix for Herself" -- without VSI, saving 100% is much harder than previously. Should this be addressed?

Simple 7 "Blocked by a Snowball" -- the usual problem. I suggest 20/20 (this is fine, even for an early level, as there is no immediate danger and you can use the walker to free a blocker). Simon suggests 19/20, perhaps this is better.

Simple 8 "Goblin City" -- same. High lix count is deliberate to allow the obvious solution (block, bash, platform) with plenty of leeway; however, 100 is unnecessarily high. I suggest 10/50.

Simple 11 "Little Miner Puzzle (part 1)" -- is this level really appropriate for so early? Several of the miner placements are high-precision. If it stays, lix count could be reduced (maybe even to 1!) to avoid other lix getting in the way of selecting the correct lix for mining.

Simple 12 "Get Down from There!" -- usual problem. Also, 75/80 makes the level feel more imposing than it actually is. I suggest 20/25.

Simple 13 "Let's block and blow?" -- not a big problem as SI is low. However, as the level is so short and simple I'd be inclined to reduce it to 19/20.

Simple 15 "Put Your Lix on Ice" -- remove floater, imploder, blocker.

Simple 16 "Alternative Methods Recommended" -- retitle? Most solutions will not finish the path while lix are still coming out, but it is possible. I suggest 30/40.

Simple 18 "Minimalism (Part 1)" is unsolvable. I'd like to propose we replace it with my contest level, "A Necklace of Raindrops", perhaps placing the latter as Simple 11 so that "Little Miner Puzzle (Part 1)" can be moved up.

Simple 21 "Lix Potion Number Nine" -- intended solution changes SI, but level is possible without. Should it be left at SI 50 or changed to SI 4? If changed, doing nothing solves the level, but players still have to realise the trick. If left at SI 50, reduce to 20/40.

Simple 23 "Four Corners" -- usual problem. I suggest 36/40.

Simple 24 "Pitfall" -- change to 29/30.

Simple 25 "Ferry Tale" -- exit top is missing.

Simple 31 "Low Clearance" -- usual problem. I suggest 30/40.

Simple 32 "The Lion, Lix and the Wardrobe" -- change to 20/40.

Simple 33 "Don't Leave Me Hanging!" -- change to 30/30.

Simple 34 "Fear of Heights" -- the solution I think intended requires VSI. Level is solvable without, for instance by waiting until all lix are out, then digging in the middle. This feels like a hack and requires a long wait. Maybe the level should be replaced altogether?

Simple 35 "One Way Road" -- needs hyphen in title.

Simple 38 "The Two Towers" -- change to 38/40.

Simple 40 "The Road Goes Ever On" -- for consistency with S1, 10 lix and SI 50. Could require 100% as this is easy. Could also reduce skills to 20 builders and platformers, 10 of all others, but perhaps it's better to leave the higher skill counts so novice players have more leeway?

Okay, here's another attempt at a version of The Hotel in Hell that works without VSI.

It still has a time limit, but the time limit on this level is (and always has been) purely aesthetic, so it won't need any further modifications if time limits are removed from the game.

This mostly overlaps with http://www.lemmingsforums.net/index.php?topic=2520 so I have closed this one.

When I create a new terrain piece, the window should jump to the bottom, showing me the properties of the new piece, instead of jumping to the top (current behaviour).

When I select a piece, the window should jump to that piece.

If I play part of rank A, select rank B, then select rank A again, the game takes me to the first unsolved level of rank A, as expected.

If I play and complete all of rank A, select rank B, then select rank A again, the game takes me to the last level of the rank, instead of the first as expected.

One somewhat strange feature of NeoLemmix is that completion of a level is awarded a score based on a complicated algorithm whose details are hidden from the player. In theory, this allows another dimension for competition / challenges. In practice it seems to be ignored; there was a topic in Challenges for best scores on the original levels, but it quickly died, and nothing similar even got started for custom levels.

One possible reason is that Lemmings just isn't the right kind of game for a numerical score -- it already has a natural metric for comparing solutions, namely number of lemmings saved. (Simon has claimed that no-one cares about scores in any game, but this is certainly false.)

So there's a question whether the scoring system should be kept into NeoLemmix 2 at all.

If it is kept, my first suggestion for improving it would be to allow pack designers to customize the algorithm -- i.e. they can decide what to take into account and how many points each factor is worth. For instance, if I were to do a pack I'd like to use a simpler system. Pack designers who don't want to have a scoring system at all could disable it. It wouldn't matter that the algorithm would vary from one pack to another, since comparison of scores across different levels is meaningless.

Also, I suggest that if it's kept, the scoring system should be made more significant. The game itself could keep track of your best score for each level, and display it under the score just achieved on the post-completion screen. Achieving above a score threshold could be one category for talismans.

Dodochacalo's famous Lemmini set, DoveLems, is now available to play in Lix! 

This set requires the original terrain -- you can find information on installing the original terrain in the file "oldterr" in Lix's docs folder. (Rubix asked me in chat whether I was going to remake these levels in Lix terrain, and the answer is, I would love to, but it would be far too much work -- there are 124 levels and they are all intricately designed.)

22 levels turned out to be impossible as they stood, due to differences in gameplay mechanics. All these have been fixed, in whatever way I thought best for each individual level. I've also made two other global changes to the levels: (1) Lemmini has larger exit triggers, so some levels had an exit partially covered by terrain, such that it was meant to be enterable, but in Lix the terrain covers the entire trigger. All these have been fixed by moving the exits upwards, even if the level was still possible. It doesn't always look neat, but from a gameplay point of view I think it was the right decision. (2) Lix has fewer frames per second, so an equal time limit is effectively harsher in Lix. Only one level (Maso 29) was impossible just because of time limit, but some others became unnecessarily frustrating. On all levels with a time crunch (that is, less than 1/6 of time remaining) I increased the time limit by 1/6.

I made a few other changes to individual levels:

* On Plain 12, the staircase wasn't working because some terrain pieces had an odd x-coordinate, which meant that because of the way Lix reads hi-res graphics, some terrain pixels were effectively counting for two. I had to fix the staircase on the level's repeat as it was impossible to complete otherwise; so I fixed it on both levels. Other levels with similar problems were Plain 5, Maso 4 and Maso 27.
* Coward 24 is dependent on fake steel, which doesn't work in Lix. I decided to make the level completable but trivial, rather than leave it out altogether. After all, who knows whether someone playing this set might feel inspired by this level?
* Some levels have been updated and I was working from the earlier version of the levels. However, in the case of Devilish 14, I copied over the stats from the updated version, because in the earlier version, this level could be solved with the identical solution to the level it is a repeat of (Devilish 3).
* Devilish 18 is a three-entrance level, so lemmings should come out in the order A, B, C, B. I achieved this by duplicating the second entrance. I didn't do this on the other three-entrance levels (Plain 17 and Coward 27) as it doesn't make much difference there, so I preferred to keep the entrances in the more natural order A, B, C.
* Devilish 30 had a known backroute, which I fixed using a suggestion from Akseli. I don't see it as my business to fix backroutes on these levels (and playing them in Lix introduces unintended solutions on many levels, particularly because of the lack of one-way wall). But I felt I had to fix this one because the level is one of the hardest and most beautiful in the entire set.
* Maso 27 depends on bashing under fire traps. Unfortunately, L1's fire traps have trigger areas extending twelve pixels under the bottom of the visible object, because L1 hazards only trigger when the lemming's foot touches them, and the designers wanted this trap to look like it killed the lemmings when their heads touched the fire. In Lix, fire hazards kill lix if their foot or heat touches the trigger area, so even if I moved the traps up, the lix would be killed seemingly without touching the traps at all, and the player would have to guess what was a safe distance. To avoid this, I replaced all the fire traps with squishers -- the level requires 100%, so the squishers only killing one lix at a time doesn't create any new solutions.

I have not changed any levels in order to compensate for the absence of one-way walls or other features of Lix gameplay. That would have been too much work. This means that some levels intended to be difficult have ended up trivial... but some of the new solutions that are possible in Lix are interesting and were great fun to discover

This is a topic for posting your multi-player creations! 

To start with, I've remade the original 2-player levels in the new Lix styles, adding the new skills. In general I've kept the skill numbers the same -- the usual complaint about these levels, not enough builders, is offset by the addition of platformers. All levels with blockers now have batters; I've added walkers and jumpers to most but not all levels. However, let me know if you think the skill balance could be improved further, or if you have any other suggestions

EDIT: Fixed the mesh on Level 8.