Son, if you're expecting a rank called "troll" to be fun and enjoyable to play, you're missing the point entirely. I put those levels in for the express purpose of causing suffering. They aren't intended to be good, they're meant to showcase how creative I am when it comes to being an inconsiderate jerk, and perhaps to show some things to avoid if you're trying to make levels that are actually good. Do they deserve to be in the pack? Heck no. But they're there now.

The saddest part is that at least a couple of the levels are just corrupted versions of decent ideas; I just made versions of them that eliminate the repetitive troll garbage by cutting down the total number of Lemmings and they're actually good levels now.

As for which levels have significantly changed, I don't really remember. A bunch got backroute fixes that were relatively minor, some were bigger than others, and a few levels like "Sewage shaft" got seriously reworked.

Version 1.2 is out!
Features backroute fixes, some level rearrangement, some changes to certain levels to make them suck less, and a new 5th rank with 10 more levels to play! Check the first post in the thread for the new downloads.

Compression and loop setup complete. Check my earlier post for the download link.

If anybody else has made custom contraptions for The Incredible Machine: Even More Contraptions, I'd be willing to play those. I have actually swapped contraptions with someone in the past and it was pretty fun.

Is real early in the morning for me but I might still pop in midway through for a little bit. I'll likely need some help figuring out how to make things work.

Looks like it finally has the solutions I'm going for. Yes, the execution at the start is now very fiddly, but if I turn down the release rate too much then it allows the old backroute to come back again.
That said, it can be lowered a bit without letting the backroute reappear. It's still a little fiddly (I think the left side is the harder side now thanks to having to use a different skill), but it's better. Hopefully I won't have to make any more changes after this.
Thank you Icho for being so patient with the testing!

A good idea. Something I've noticed very little of is custom win/lose music for level packs. I'll post mine here.
Remember to name them "success.ogg" and "failure.ogg" and to insert them into your pack as custom files if you want to use them.