Yeah, these collisions come from taking an existing level, then re-saving it under a new name to make a new level. Here, the author should re-roll the ID for the new level. The editor has a button to re-roll. But the author must still deliberately click that.

If you copy-paste or save-as your level to make a new level, re-roll the ID for the new level.

Right, re-rolled IDs or new-level IDs are unlikely to collide. ID is 64-bit integer (there are 2^64 possible IDs). Birthday problems will start around a billion levels (10^9 levels) with a 1 % to 3 % chance of collision. A sensible upper bound is that a million levels will ever exist. With a million levels, the chance of birthday collision is practically zero; it's around a millionth of a percent.

-- Simon

Quote from: WillLem on April 29, 2026, 03:43:34 AMUpdate to 'special' - added crystal exit as separate base/top images for upcoming RotL reissue.

As with the other proposals, changes to the official styles would need to see some discussion. And in this particular case - I feel like I would probably veto it anyway, on the grounds that the appropriate place for this piece, if it really must be used at all, is a (user)_special or rotl_special style, not an official style. (Any further discussion on this subject will need to go in its own topic, not this one.)

The other two have been updated in both the all-styles ZIP and the style manager.

It is extremely unlikely that a duplicate ID will arise between two levels made from scratch.

The main cases where it's likely to come up:
- Variant levels (eg easier / harder repeats)
- Levels derived from an official level

It is possible an author might do an all-packs check by combining the packs into a single large one (rank / pack structure doesn't really matter for this, they could just copy the levels) and running a check against it. In this case, the IDs would matter again.

Mass replay check is the only time an ID issue will outright break anything. In all other cases, it will at worst cause a warning to be displayed. But this would arise from the replay having a wrong ID; not two levels sharing an ID. That being said: Keep in mind that even if you don't want to mass check your levels, other users might.

Just letting you know about an update to dex_circuit. It contains a fix to the pickup object which mistakenly had an offset hitbox. (The updated version is fixed using graphical offsets, so any existing levels which use this object should be functionally identical  )

Just letting everyone know about a quick fix for the pickup for dex_circuit (thanks GuiGui! ), see OP for more details. Also updated all the preview images to use dropbox instead of imgur.

New level 49

Quote from: 92Dexter11 on June 09, 2026, 06:09:13 PMWelcome to the forums! This is a pretty nice level pack, although I do have some things to point out.

Level 68 has a missing object that the style manager couldn't download. I loaded the level in the editor and the problematic object in question was an exit. For the purpose of my playthrough, I replaced it with the default crystal exit.
Level 87 has a ton of missing terrain pieces that the style manager couldn't download that I wasn't able to replace, so I wasn't able to complete this one.

I was able to complete every other level, except for level 49 which seemed excessively difficult. The replay that you provided for this one doesn't work on my version of NeoLemmix, which leads me to believe that there may be some shenanigans with different terrain pieces.
Are all your styles up to date?

While overall this pack was quite easy, there are quite a few headscratchers that I was stuck on for a while!

My favourite levels are:
13, 31, 52, 69, 70, 76, 83, 84, 86, 90, 92, 94 and 97.

Also, level 35 has the funniest replay.

My replays are attached.

QuoteLooking at the zip itself and opening the levels in Notepad and then later on in NeoLemmix itself, you have all levels titled 01-Easy, 02-Easy, etc. all the way to the final level, which is called 99-Easy. These aren't very catchy or interesting level titles. Surely you can think of better ones?

I personally didn't really mind the lack of titles. Design-wise, the levels have a minimalistic feel that I quite enjoyed, and I feel the lack of titles helped complement that. That's just my opinion, though, I'm not really sure what the consensus of the lemmings forum is on levels without titles.

My apologies regarding level 49. I hate it myself. It requires more skills. I shall attach a new level 49. Please copy it. Level 87 works fine with NL CE.
Thanks for playing the levels. I hope you enjoy the hard pack... Coming soon

Lix 0.10.33 released.

Download for Windows 64-bit -- recommended
Download for Windows 32-bit -- fallback for ancient machines
Download for Linux 64-bit
Source code
Changelog
Issue tracker

How to update

Quick and dirty: Extract over your old installation. Level moves will then result in duplicate levels that remain in your level tree.

Clean method: Extract to new directory, then copy these directories from old Lix into new Lix:
user/
replays/
...and any levels that you've built yourself or added manually.

When we mouse-hover over the digger assignment, the bashing lix gets highlit because that lix has been that digger.

• In the tweaker, when you hover over an assignment, the line will be printed in white. The so-assigned lix on the map will also be highlit in white, regardless of where that lix is or what that lix is currently doing.
  
• Added geoo's 2 levels from Level Design Contest 30, Cycle Decomposition and Misaligned, to single/misc/contests/.
  
• Fix #499: Now, the dark background of on-map tooltips spans the full width of the text.
  
• Attribute the laser animation to Zanzindorf in doc/thanks.txt. I've forgotten that back when we added Zanzindorf's lasers. Sorry -- it's now finally in!
  
• Code: Remove the custom reimplementation of al_convert_mask_to_alpha() and revert to Allegro 5's. The custom implementation was an attempt to fix #431 (Magic Pink isn't converted on macOS), but it didn't help. In the meantime, a change to Allegro 5's image loaders have fixed #431.
  

-- Simon

Welcome to the forums! This is a pretty nice level pack, although I do have some things to point out.

Level 68 has a missing object that the style manager couldn't download. I loaded the level in the editor and the problematic object in question was an exit. For the purpose of my playthrough, I replaced it with the default crystal exit.
Level 87 has a ton of missing terrain pieces that the style manager couldn't download that I wasn't able to replace, so I wasn't able to complete this one.

I was able to complete every other level, except for level 49 which seemed excessively difficult. The replay that you provided for this one doesn't work on my version of NeoLemmix, which leads me to believe that there may be some shenanigans with different terrain pieces.
Are all your styles up to date?

While overall this pack was quite easy, there are quite a few headscratchers that I was stuck on for a while!

My favourite levels are:
13, 31, 52, 69, 70, 76, 83, 84, 86, 90, 92, 94 and 97.

Also, level 35 has the funniest replay.

My replays are attached.

QuoteLooking at the zip itself and opening the levels in Notepad and then later on in NeoLemmix itself, you have all levels titled 01-Easy, 02-Easy, etc. all the way to the final level, which is called 99-Easy. These aren't very catchy or interesting level titles. Surely you can think of better ones?

I personally didn't really mind the lack of titles. Design-wise, the levels have a minimalistic feel that I quite enjoyed, and I feel the lack of titles helped complement that. That's just my opinion, though, I'm not really sure what the consensus of the lemmings forum is on levels without titles.

Third stream will be tomorrow, Wednesday, June 10th, starting 17:00 UTC. This will be 19:00 CEST, 18:00 BST, and around noon in America.

-- Simon