By the way, if I've missed anything on the high % tables, let me know.

Some of the % for LPII (not the Bonus Pack) are improvable. I haven't checked whether someone else already got them, tough.
Sneaky 6: 75% (using blocker-cancels-trigger-glitch)
Sneaky 9: 97% (slightly tweaking the game mechanics)
Genius 4: 80% (optimizing my previous solution)
Genius 14: 81% (just RR-fiddling with the intended solution)
Genius 19: 96% (obvious improvement of my backroute which already saved 94%)

Although this is slightly off-topic, the level Psycho 30 from LPDos can be improved to 98% as well. I attached this extremely glitchy backroute.

Thanks for your feedback!

Level 1: I did not know that lemmings turn around at the edge of the screen . So you missed completely the trick I was trying to advertise with this level. I have removed this backroute in the new version below.
Level 2: How long did you need to execute THAT??? I never guessed that anything like that could possibly work and your solution is definitely MUCH harder to pull off than mine. Though it isn't the trick I wanted to be applied, anyone who can think of such a solution deserves to pass the level. So I will not consider your solution a backroute (at least for now  ).
Level 4: Intended solution.
Level 7: Clever... extremely clever... extremely extremely clever ! That's completely different from anything I tried so far and it's a honor to declare your solution to be one of the official ones.
Level 8: This is exactly the type of backroute I wanted not to exist. I fixed this in the version below.

Thanks for updating the Bonus Pack! I played the modified levels again and solved Reverse 4, Reverse 5 (which is a very good level now ) and Flight 6 mostly in the indended way.
Rush 4 though... First of all my backroute still works, though it's harder to execute now. After that I tried to find a solution that looks more like an official one. The first half of the solution I found then is pretty similar to yours, but finishes with a shortcut. Neither of my two solutions is nearly as beautiful as your intended one.
I also played the secret gimmick level after looking up the trigger area: While not one of my favourites, it's a good level nevertheless. Compared to your intended solution, there is an easier way for crowd control though.

The past days I had some waiting to do and decided to determine some skill values for the remaining three Psycho-levels. As they come with an abundance of terrain removal skills, one should not be surprised that only very view skills are actually necessary. In detail:

Psycho 22: 2 Builders
After namida's work, only builders, bashers, miners and diggers were left. Removing bashers and miners is rather easy. Replays for no diggers and only two builders are attached. Nothing special with these solutions - just awfully precise terrain removal.
Slightly off-topic: I watched namida's no-climber solution for this level. But I wonder what kind of game machanics transports these three lemmings to the top of the screen?

Medi 28 (the easy version of Psycho 22): 2 Climbers, 1 Builder
Doing Psycho 22 convinced me that Medi 28 should be improvable on climbers. But actually doing so turned out to be one of the worst ideas I ever had. Just watch the replay.
Btw. it can easily solved using only 24 skills in total.

Psycho 27: 2 Builders, 1 Basher
Floaters, blockers, bombers and diggers are easily removed. The solution removing climbers and miners is (of course) a backroute, using a basher-stair on the left. The same goes for the solution with only 2 builders. Surprisingly reducing bashers works less well using the backroute (I only got down to 3 or so). So one has to adapt the intended solution.

Psycho 29: 1 Builder
Floaters and bombers are trivially discarded. The attached solution without miners can easily be turned into a solution without blockers. Alternatively one may replace both bashers with miners, removing the bashers from the skill list. Now only climbers, builders and diggers remain. Each of those has a replay attached.
This even improves on Danger 20 (No salvation IV).


Furthermore I noted some more levels, which could probably be improved (though I haven't checked yet):
Medi 6: Are all the terrain removal skills really needed?
Medi 23: 3 builders? Even less??
Medi 30: The blocker should be removable.
Danger 2: Not for improvement, but: How do 1 floater and 14 builders in the min. skill list fit with a minimum of 14 for total skills?
Danger 12: Just looks improvable.
Danger 16: Do we really need 4 bombers?
Danger 19: Are all the terrain removal skills really needed?
Danger 23: Where do we need the digger?
Psycho 5: What happens if you use the turning lemmings to bash away 6 pixels on the left?
Psycho 13: Why the blocker and bombers?

I had another go at the levels I previously failed to solve. Some of the more interesting replays are attached.

Trial 3: Looking back at the solution, I wonder what made the level THAT hard.
Trial 4: Got the intended solution.
Trial 5: Found some alternative way...
Trial 6: Sure, 100% is possible for the right-hand side as well. I found it even easier than going left, which I solved similarly to DynaLem. Together with Challenge 2 this is my favourite level.
Reverse 6: I actually got both of my approaches working, though one may easily guess what the intended solution is.
Rush 4: Probably the same backroute as Akseli.
Trial/Challenge Secret Level: Pretty straight-forward solution using only one type of skills while even saving one more lemming than needed. The trigger area for this secret level is surprisingly easy to reach. I checked some far more inaccessible places first.

Haven't found the trigger in the gimmick levels yet.

I finished yesterday the last of your great levels. Many thanks for these hours of fun!

Nevertheless some remarks:
- favorite levels: Treetop Trial, Panic Attack and Only one Lemming away 
- least favorite ones: all Floater Frenzies (sorry, but I don't see the point of these levels) and Overflow zone (I usually hit F11 right at the start and then stare at the screen until I have a solution - but that's probably the worst approach to this level)
- I really liked the idea of one-way areas, but quite often they had the flavor of backroute-fixes instead of being a genuine part of the puzzle.
- I like the look of the Psychodelic, Sand and Metal style; the Tree style could use some more texture in the leaves but is nice otherwise; and I better say nothing about the Purple style...
- There are serious backroutes for Jailbreak (Cunning 12, glitchy), If you're lemmy and you know it (Genius 3, non-glitchy) and Wrong way, Mister Lemming (Genius 19, glitchy). See the replays attached.
- Treetop Trial can be solved (even non-glitchy) using only 2 builders (instead of 3). If you don't know such a solution already, consider this a challenge.

EDIT: Thanks for the remark about LPDOS, but I already played these levels some time ago. If I find the time to look at them again, I might even participate at the voting for the best level (but don't wait for me).
About being new here: That's only partially true. Although I registered recently, I follow this forum for quite some time now.