For the second half of 2020, I'm planning:

• Undo in the editor. I've poured serious effort into undo, but it's not finished. Undo must become a non-buggy releaseable feature. At first, only tile additions/deletions will be undoable. More actions will follow to become undoable. Probably some minor actions won't yet be undoable by end of 2019. We'll see.
  
• Introduce an end-of-level screen that previews the next level. Maybe offer two levels: The next level, and the next unsolved level.
  
• Replay tweaker: Add insert mode
  
• Probably no physics change, no introduction of neutral lixes yet, ... But I should propose a battle plan for such breaking changes. Physics have subtle bugs, and I still haven't merged fixes that have been cooking since summer 2017.
  

-- Simon

Here is a list of all single player Lix level packs and scattered levels. It was split off Wafflem's list for all Lemmings-like games. Packs/levels are ordered by author name.

Current but not included in the main release:

Level Packs:

none

Scattered Levels:

Winter Rations by geoo
Level for the Level solving contest #3.

Richard of Gloucester by Proxima
Level for the Level solving contest #2.

Included in the main release:

ClamLix
Full pack with 113 levels by Clam: 91 levels plus 22 outtakes.

xmas2018 by F and Simon
Holiday-themed pack with 24 levels.

Miniatures by geoo and Simon
Originally 10, now 17, levels with small level sizes, inspired by the small size of Gronkling's levels. Part of the misc folder.

Tutorials by geoo, Rubix, Simon and Wuzzy
As of 7th Feb 2019 it contains 15 basic tutorial levels. Advanced tutorials are planned.

mobius's levels 2017
A later set of Lix level packs, including "leftovers" (some of them are included in the lemforum pack) and "non-tutorials" (7 levels loosely based off the L1 Tutorial levels). Part of the misc folder.

NepsterLix
Full pack of 96 levels.

Nessy's levels
10 levels, some converted from the NeoLemmix pack "Lemmings Migration". Part of the misc folder.

Epic Adventure by RubiX
Full pack of 173 levels. Contains Parallel Universe and the Community Collab Project #1.

Simon's levels
Some levels by Simon that are not miniatures. Part of the misc folder.

lemforum (Lix Community Pack)
Full pack with 240 original levels by various authors, including remakes of Lemmix and Cheapo levels. Some levels are from the abandoned Project Capybara, its remaining levels later became mobius's small level pack in 2017.

lemforum outtakes
Levels that were at some time part of the Lix Community Pack but later exchanged for other levels. Can be found in misc/lemforum-outtakes.

Contest levels by Various
Levels made on occasion of various design contests. Can be found in misc/contest.

Outdated:

Level Packs:

TameLix by Clam
Only for C++ Lix. 20 ONML Tame levels in Lix with new puzzles. Each level has an easy and a hard puzzle.

DoveLems by Dodochacalo and Proxima
Only for C++ Lix. Originally a pack of 125 levels for Lemmini, DoveLems has been converted by Proxima, excluding Lemmings' Ark. This pack needs separate Lemmings tilesets that don't ship with C++ Lix.

Lix tutorial levels by geoo, Rubix and Simon
Levels meant to serve as tutorials for the basic skills. Some of them are in Lix main release again as part of tutorial/basic. Some levels use outdated tiles.

mobius's level sets
Lix levels remade from Lemmix. Some of these became part of the Lix Community Pack. Some levels show missing terrain due to the culling of decoration pieces, just save and reload in the ingame editor.

Prob Lem's levels
Several levels. Hrududu made its way into the Lix Community Pack.

Reloaded by RubiX and others
Lemmings 1 levels remade in Lix with new puzzles.

Time Trials by RubiX
Five levels with time limit challenges. Time limits are not supported anymore in Lix.

Scattered levels:

Raylevels by Raymanni
One level can be found in this thread, which uses out-of-date tiles.

Happy Holidays by Raymanni, fixed by Forestidia to tileset renamings
Chimney Climber by Simon
These levels showcase the Holiday tileset by Raymanni. Both included in the xmas2018 pack, see above.

Contest levels:
Some contest levels may depend on features of C++-Lix, e.g. time limits, which are not supported anymore in Lix. Most of the levels are included in the main release.

16 x 16 by Akseli
Entry for the Lix Double-Level Contest 2014. Shows missing tiles due to tile renamings.

Planet Dulux by Akseli
Entry for the Lix Double-Level Contest 2014. Shows missing tiles due to tile renamings.

The Climber Predicament by geoo
Entry for the Lix Double-Level Contest 2014.

The Floater Predicament by geoo
Entry for the Lix Double-Level Contest 2014.

Minefield by geoo
Entry for the Level Design Contest 5

Las Ranas Hermanas by geoo
Entry for the Level Design Contest 6. Included in the lemforum pack of the main release.

Marching Band by geoo
Entry for the Level Design Contest 10

Inseparables (V2) by geoo
Entry for the Level Design Contest 11

The New Compression Method (V3) by geoo
Entry for the Level Design Contest 11

Deadly Cells by geoo
Entry for the Level Design Contest 15. Included in misc/miniatures, which is part of the main release.

Cirque Du Solix by mobius
Entry for the Lix Double-Level Contest 2014.

Cirque Du Solix (part 2) by mobius
Entry for the Lix Double-Level Contest 2014.

Amethyst Nightmare Shrine by NaOH
Entry for the Lix Double-Level Contest 2014.

Temple to the Frog Gods by NaOH
Entry for the Lix Double-Level Contest 2014.

A Day in Lixtown by Nepster
Entry for the Lix Double-Level Contest 2014. Included in NepsterLix, which is part of the main release.

A Night in Lixtown by Nepster
Entry for the Lix Double-Level Contest 2014. Included in NepsterLix, which is part of the main release.

Altruism by Nepster
Entry for the Level Design Contest 6. Included in NepsterLix, which is part of the main release.

Oh Yes, Here Again! (V3) by Nepster
Entry for the Level Design Contest 11

All Around the World by Proxima
Entry for the Level Design Contest 4. Included in the lemforum pack of the main release.

A Necklace of Raindrops by Proxima
Entry for the Level Design Contest 10. Included in the lemforum pack of the main release.

Tailor-made for athletes by Proxima
Entry for the Level Design Contest 10

Oh No! More Tame Levels (V3) by Proxima
Entry for the Level Design Contest 13

Turnabout Sisters by Proxima
Entry for the Level Design Contest 15.

Eyesis (Part I) by Ramon
Entry for the Lix Double-Level Contest 2014.

Eyesis (Part II) by Ramon
Entry for the Lix Double-Level Contest 2014.

Waiting For The Answer (V5) by Rubix
Entry for the Level Design Contest 9

Palmtree Pile-up (V1.2) by Simon
Entry for the Level Design Contest 5. Uses an outdated tile.

Long Division (V25) by Simon
Entry for the Level Design Contest 10

Flying Squirrels (V2) by Simon
Entry for the Level Design Contest 11

Key to the Mini Kingdom (V9) by Simon
Entry for the Level Design Contest 13

-- Simon

Log into forum.
(Don't have Simon's custom CSS enabled that cuts off the top-right box.)
Ensure that there are no new replies by anyone to your posts.
Be on the forum's front page.
Click "Show new replies to your posts" in top-right corner.

Observed: We go to a new page that prints an SQL query error.

Expected: Something cleaner.

-- Simon

Split off from 3 things I don't like about neolemmix.
Related: Hidden Objects in Backroutes: OK?

Original statemet by WillLem: I'd say the biggest irony of the NeoLemmix philosophy is that, via its player-assist tools, it makes things like precise skill placement and hidden objects a complete non-issue, and yet it still vehemently rejects these things as being an occasionally valid part of the game.

I (Simon) happened to reply first:

---

precise skill placement [...] a complete non-issue, and yet it still vehemently rejects these things as being an occasionally valid part of the game.

When a design absolutely requires precision, well, let the solution be precise.

When a design doesn't need precision, why force the player to be overly precise?

and hidden objects

The puzzle will never gain anything from hiding, thus don't hide.

-- Simon

Split off from: Multiplayer Quality of Life, renamed to New observers should watch game in progress

---

Observers should have the level maximum zoomed out by default to have a good overview what is going on. Else the observers have to zoom manually, which can wear one out especially with short matches.

Good idea, observers need good experience without any input.

Easy change to choose the initial zoom based on whether we're observing or playing. I'll look into this.

-- Simon

(Moved: Bug #1: On assignment for frame n, first erase old assignment for n)

Bug #2. Zoom such that the right-most column of terrain pixels is only partially visible in your NL game window. Toggle pause several times. The right-most column of pixels sometimes is black, sometimes it shows the terrain properly. Expected instead: Always shows the terrain properly. Speculation: You have code duplication in the camera.

Bug #3. Have a gigantic screen, and zoom out to 1x. Have a large grey dead area at top/bottom of map. The mouse is trapped in the playable area, mouse cannot go to the dead area. Open the load-replay dialog. Your mouse cursor is still trapped within the map, the mouse cursor cannot move everywhere in the dialog, I can't click some files in the dialog. Expected instead: Trap mouse only if the game isn't the focused window.

-- Simon

I (Simon) have been the head admin. I haven't done as much as I could have: At least, I've deleted spambot accounts and their posts within a few hours. 1-2 spambots per month successfully bypass registration.

namida has done the most on the technical side: He has moved the site from NearlyFreeSpeech to a VPS (virtual private server) with full shell access, we can install anything we want. After some trouble with IPv6 routing, everything was on track soon, and the site has run extremely well on his VPS ever since. namida still funds the site himself, plus any donations that go 100 % into hosting costs site costs, excluding transaction fees.

The code of Lemmings Forums (Simple Machines Forums and some custom changes) is on Nessy's github repository as a backup.

Gigalem requested very sensible changes, e.g., change the ICQ personal field to a Discord account field in forum user profiles. But we haven't implemented any of these changes, sadly. I think we haven't changed the code in 2017 or 2018 at all. We merely put the change requests on the github issues page and let them sit.

The database (accounts, topics, posts, private messages, attachments) has no automation: We still have to back it up manually. We aren't diligent with this, occasionally I push Nessy to back it up, maybe once every 3 months. This is not smart; if the server dies, we lose around 3 months of culture. Bad. We have to look into automation.

Around November 2018, we had a massive traffic spike: For about an hour per day, we had 600 currently active guests, nearly everything from a few IP addresses in China. This didn't look like an attack, and it's well over now.

Our level designers still create and test each other's levels, the culture continues. That's what counts the most.

-- Simon

NL 12.04

This seems hard to reproduce, and I speculate that it's a race condition in NL's keyboard/mouse input polling.

• Have a machine that endures a framerate drop during continuously held framestep-back. I repro this on my laptop (can't test on desktop today): 2018 laptop, Intel integrated graphics chip, Arch Linux, NL runs in Wine 4.0-rc3.
  
• Map hold-to-scroll to RMB (right mouse button) and framestep-back-by-1-frame to 2 (the number 2 = the key above W).
  
• Play a large level, e.g., Minim level-solving contest 1.
  
• Zoom into the level far enough such that the game allows you to scroll around the map, i.e., do not have all of the map visible at the same time.
  
• Fast-forward to maybe 5 minutes in the level. No need to assign anything.
  
• Press and hold 2 (the number key) to framestep-back continuously. Never let go of the key until you're done reproducing this bug.
  
• Press RMB (right mose button) and hold it for about a second, move the mosue frantically while holding as if you were scrolling with hold-to-scroll. Repeat this step several times.
  

Expected: Every press-and-hold of RMB in the last step allowed you to scroll via the hold-to-scroll function.

Observed instead: Only some of the press-and-holds allowed you to scroll.

-- Simon