@kaywhyn: In answer to your query, the other LemFan packs I've played are 100% solvable: BadLems (40 levels), NumLems (100 levels) and LemFan's Pack 3 (11 levels).
I'm not aware of any other unplayable levels apart from those mentioned in recent posts.

@JawaJuice: thanks for your comments on Lemmings Obliterated. I'd be interested to see your solution for 'Walk in the Woods'

Spoiler

So did you find a way of getting the 'mine back all the way' solution to work? I spent a long time trying, but could not find a way.

Okay, made some updates after being away for a week with a fresher mind!  Lemming Ledger is coming together although I wished I didn't have to add steel there since it feels a bit patchy to me.  Patching Reverse the Polarity clicked for me when I realised I could adjust the intended solution in a such a way that it no longer necessitates the Floater (I also removed a Miner that I accidentally gave to the player right from the off, especially as that breaks the guidelines for Rule 3).

Lemming Ledger - V9:

Changelog

- V2: Terrain under rightmost brazier is now steel to prevent backroute from JawaJuice
- V3: Removed some of the steel above the exit to prevent backroute from JawaJuice
- V4: Retracted steel above exit slightly to prevent backroute from JawaJuice
- V5: Added a brazier inside a hole in the terrain to patch a backroute from JawaJuice (they're getting good a this!)
- V6: Added left-facing one-way arrows to the terrain above the middle brazier to prevent backroute from JawaJuice
- V7: Thickened wall above exit to prevent backroute from JawaJuice
- V8: Reverted the V7 and improved the V2 and V6 changes to prevent backroutes from JawaJuice
- V9: Added some steel plates near the diagonal wall to prevent backroutes from JawaJuice

Redneck Redemption - V4 (unchanged):

Changelog

- V2: Bad version (shrunk terrain to the left of the exit, rejected it as a fix, but uploaded it by mistake instead of what is now V3!)
- V3: Added a steel plate to the left of the bottom exit to patch a backroute from JawaJuice
- V4: Reduced the height of the terrain above the steel to patch a backroute from JawaJuice

Reverse the Polarity - V8:

Changelog

- V2: Moved pickups on bottom platform slightly to prevent backroute
- V3: Reshaped the steel under the rightmost Digger pickup to prevent backroute from JawaJuice
- V4: Steel plate and decoration added to upper platform to prevent backroute from JawaJuice
- V5: Reverted change of V4 and moved second Blocker pickup instead
- V6: Added a steel tip to the top platform to prevent backroute from JawaJuice
- V7: Added a lower platform with a trap to prevent backroute from JawaJuice
- V8: Made the lower platform longer and removed Floater to prevent backroute from JawaJuice.  Fixed bug where a miner was available to the player from the start

Quote from: mobius on September 06, 2018, 01:01:04 AM7-7: Swarthy Seadogs!

I'd like to add two interesting details about this level that can be used to complete it faster.

a) The lever that empties the aquarium also summons a deadly shredder. As Kaywhyn discovered, the aquarium remains empty if you return the lever to its original position. The shredder, however, becomes harmless again.

b) Walkthroughs  for this level (including the one in the Lemmings wiki) recommend using a safety net for the fall from the middle platform. This is completely unnecessary. Even though it is hard to see, the fall height from the top platform is greater than from the middle platform.

In the following video, I used the points mentioned above to get all 100 Lemmings into the balloon within 2 minutes.


P. S.: I also played this level in the so-called "big demo" (which can be downloaded from Lemmings Universe) in order to test if the splat height of this level has been affected by any patch. But also in the demo, the fall from the middle platform was below splat height.

Thanks for making this project, it is really nice. I built and ran it on Linux. I even made a PKGBUILD so it is easily installable on Arch Linux https://aur.archlinux.org/packages/loap-git While doing this I had to do a small patch where I put the settings, progress and replays in the proper user directories. I think you should patch the source to do this too. Something I couldn't figure out is if it is possible to pan and rotate using the mouse? It did not work for me at least but the code seems to suggest it should be possible. Some of the background graphics are horribly low quality so it would be nice if we could replace them with higher resolution versions if possible. I'm also wondering if it would be possible to replace some of the sprites with proper 3d models or to make the lemmings voxel based like in voxel doom if you are familiar with that project. Anyhow, great work

Ah Guigui, I think I owe you an apology re: my comments on ONE 2, then

Spoiler

The nuke solution wasn't my absolute first idea actually that was to build over to the button on the left side, and inside the 'hatch room', build up through the ceiling to the hatch. However, this proved impossible as it takes a minimum of 8 builders to build up through the thin ceiling and a minimum of 8 to build over to the button, making for a total of 16, which you don't have! I also thought of building up through the ceiling in both directions, but again, ran out of builders!

Not surprised in the slightest that ONE 3 was a backroute!

I AM surprised ONE 4 was a backroute - that seemed like a pretty neat solution, if I do say so myself

Also kinda surprised ONE 5 is a backroute - I just couldn't see any other way of getting the crowd close to the exit, and believe me, I spent hours on this one lol!

kaywhyn probably deserves some kind of prize for backrouting ONE 6 - that's an impressive feat requiring insane precision!

Spoiler

Just curious, is 'This is not a Lemmings puzzle' a subtle reference to Magritte's Ceci n'est pas une pipe? XD

I'll look forward to your updated levels!

Congrats on clearing ONE rank JawaJuice !

I did not have time to finish watching kaywhyn LP yet, and did not watch your solutions for ONE either. But from the comments alone I can say that the following :

ONE 2 Aquarium Deception backrouted by kaywhyn and JawaJuice. No nuke involved here. Solution is simpler and it did not occur to me that nuke was possible. You guys are crazy to even try this when the exit is so close to the hatch, you realize in 30 seconds that you dont have enough builders to go the long way, and most of all the level title tells you the Aquarium is a Deception

ONE 3 Clappy Clapple backrouted by kaywhyn and JawaJuice. My bad, backroute is obvious.

ONE 4 Clues Do backrouted by kaywhyn and JawaJuice. Compression of climbers not necessary, and kills the purpose of the level. I thought I had this covered, but you both beat me here.

ONE 5 Blues backrouted by at least JawaJuice. You're not supposed to save 3 here. Though it is funny to note that the core of the backroute solution you both gave for ONE 2 is the intended for ONE 5 !

ONE 6 The Blue Pi backrouted by kaywhyn. The athlete is the one that's supposed to go in, the way JawaJuice did. Then you can, as he said, sit back and enjoy your C.O.N.G.R.A.T.S


Now that this list is done comes the obvious conclusion : ONE rank needs yet another patch ! I should also apologize for presenting the rank as is, since it lead you to search solutions that are actually harder to pull off than what intended are, thus the frustration.

I'd say only ONE 5 may qualify as hard to execute bc it requires some precise timing at the end, though nothing as impossible as what you did in ONE 2 for instance.

So my next move is to make another update when time comes, then maybe release all intended solutions ? Not sure about that though, because I notice now that it is easier for people to find backroutes when they do not know intended, of course ! So I thank you for all being playtesters of the pack 

Nice job on the V4 updates, @The Tomato Watcher! I attach my replays, hopefully they're closer to your intended solutions now! You certainly fixed my previous backroutes with all four of these. Had to think about the updated Back again for a minute!

ok silken two hundred and sixty six

Cheers, @kaywhyn

I think the consensus is that there are only 2 packs in this topic that contain unsolvable levels. From the LemFanLems I pack, I found A Higher Platform (missing 1 bomber) and Statue of OilDrums (probably includes 2 platformers rather than 2 builders by mistake) are impossible. I think Guigui and Armani concurred with this. From Lemmings Obliterated, we all agreed that The Top Card is the single unsolvable level in the pack - and it's really not clear what LemFan was intending with that one.

I can confirm all other levels from all of the packs in this topic are solvable.

EDIT: I personally wouldn't merge LemFan's later three packs into this topic - they are all significant releases that probably deserve their own topics, but it's up to you of course! Of those packs, ericderkovits completed OddLems, I believe, so clearly that's 100% solvable. I've tried Lemmingshades and Lemmings Rundown and all I can say is they're very hard; I didn't get far into either! From what I can tell, no-one else - at least no registered member - has completed these packs yet.