- "Blocking all over the world" and "On the fence" have swapped places so that the fencer gets introduced properly before being used in a more complex setting.
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Blocking all over the world will now be more difficult due to added steel and fire pieces. Mining next to the fire object is no longer possible, thereby making one more turn-around necessary.
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Candyland climber now has an intro text to introduce the cloner skill.
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Sadistic choice: The formerly intended solution has been discarded

. Now the trap door is so low that it is not possible to platform over the splat pad without causing the lemmings from the right trap door to splat. I had given up on this solution originally because I thought it just wasn't possible, but the solution required now is what I had in mind when I first conceptualised this level

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Petrification station. Added steel to prevent shortcut for the miner.
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Ouch, my head!. Added steel to prevent shortcut for the miner. Makes on more turnaround necessary.
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Beware of collectivism. The stoners have been removed. This should be a lot more difficult now!
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Wraparound revival. Added steel to cut off the way through the "waffle"

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Lems off the wall. Added some steel to prevent a shortcut that doesn't use the stoners.
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Na zdorovje Lem. One builder removed.
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Cannibal cave. Added some steel pieces so that one can't simply go above the entire level.
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An all new challenge. Added a second "fire ball" to prevent backroute from the left side.
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How to be impractical. There was a small gap of terrain between the steel pieces that could be exploited for a backroute; it's covered up now

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C(l)on(e)fusion. Added some one-way arrows to make this more challening.
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Mission impossible. That was one ridiculous backroute, using single builder-steps to get around that flame trap. Adding a second one facing in the opposite direction will hopefully make this impossible in the future!

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I want to believe. That little bit more steel should suffice to prevent you from simply building over the pole.
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Arigato, Lemming-san! Extended the one-way arrows down into the ground everywhere.
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Connecting the dots. Here I actually
removed some steel / replaced it with normal terrain, so that one has to babysit the miner. Also added a fire trap to prevent going over the top at the end.
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Crossing the Nile. I had to add some sandbanks so that the trap triggers are in the water but at the same time you can't dive beneath them. I apologise for the pixel-precision that resulted from this, but it couldn't be done any other way, as far as I could tell. I also adapted the skill set accordingly.
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Free-floating tent, The sky is the limit and Another stunt maneuver. Before, these could all be solved in almost the same way. I added some more variations, and especially the middle-difficulty one, The sky is the limit, hopefully goes so much against player expectations that it will cause confusion!

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Fire in the hole. Added some steel to prevent going around the one-way terrain.
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Don't believe in prophecy. Added a fire- and a stomper trap to prevent a shortcut.
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Disintegrated. There was a free spot of terrain here, not covered by the fire objects as intended, that would allow for a backroute. No more!

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Going down the hard way. Can you guess it? Yes, this one also needed more steel

, which makes this rerun slightly different from the original.
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You reap what you sow. Nepster's solution was also kinda cool, but just didn't require enough of the skills for my tastes.

Not really a backroute, but I really wanted to enforce the use of the teleporter!
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Icing on the cake. Needed some steel to crush the party for the fencers.
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Man shields. Required steel beneath the one-use traps as well as in the starting tower.
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Ramp up your lemmings. This is where steel had to be introduced for the rerun that would destroy the solution for the first iteration. So don't be confused about the terrain differences, it has to be this way!
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Builder buddies. Those little plants I added as mere decoration actually ended up "corroding" the steel

. They have been flushed in deeper now so one can't dig into them!
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"The curse level", FML 06. Removed a stacker and a stoner, just an overall tighter resource limit.
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Get a foothold. I replaced those blocks with steel blocks so one doesn't simply bomb through the terrain using radiation. It may still be possible somehow, but it's probably a lot harder now.
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Acrobatic endeavors. Added another hammer trap so that the player doesn't simply lead all lemmings to the right exit with a staircase.
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Lemhattan. Added some upward-arrows. Unfortunately, the city tileset doesn't have one-way down arrows, so I needed to borrow them elsewhere. Looks a little inconsistent, maybe, but otherwise one simply could have dug there.
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Triple security. I messed with the skillset a lot to hopefully enforce what I found most amazing about the intended solution originally. What's required now is a mixture of Nepster's solution, which I took some inspirations from, and my original plans for this level.
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Apotheosis exam. All the pickup skills have been removed, upward arrows have been added. Hope these provide for a good challenge!