@Crane: Mainly new solutions to Pipe Dream and Mastermind. The two solutions to Jailbreak are the same as in V9/V10, but adapted to the modified terrain.
Moreover I discussed with mobius some other old Lemmix levels. I came up with your level Deep Freeze from Garjen05.dat (though at that point I wasn't aware that you were its creator), but with modified save requirement 76/80 instead of 60/80. In my opinion, this should turn your level into a challenging multitasking level. So if that's fine with you, I would like to propose this level for consideration as a possible level to be included in an update to Revenge of the Lemmings.
@Mobius:
Here are replays of the second batch of levels you presented here (and extended levelpack.ini attached as well).
You have been fooled: Nice medium difficulty level. The "skills you can't live without" challenge would be very interesting here.
Minimal Trouble: Either I am backrouting this level or the solution is somewhat disappointing.
One small problem: Good level, even if there is a part of the level, where I can't find any explanation why the terrain is precisely like it is now.
Oven door: You should modify one trap to actually kill lemmings and the lower left part needs very precise positioning. Apart from these issues a relatively easy level, because there is not much one can actually try.
Primal Technology: At least my solution is not really interesting. Actually the most intersting fact is, that this level plays completely different in old Lemmini, where it is still solvable but requires a rather different approach. Btw. the trap seems to do nothing at all.
Someone must help us: If I remember correctly some comment I read some time ago, my solution is not completely intended. Good level though.
Survival of the fittest: Easy level, where almost any approach works. There are long waiting periods, where lemmings just have to walk around.
Angle Angel: I can guess the intended solution, but there are easier ways to solve it. The one-way walls are just weird.
Daedalus: It would be somewhat disappointing, if my solution is intended.
Shaken Tower: Again there are many many approaches that might (and actually should) work. Easy level, that is not terribly interesting.
@backrouting issue:
In my experience it is very hard to force a specific (convoluted) solution in levels with many builders (like Mastermind or Jailbreak), because there are many tricks you can do with builders and most of them can be achieved regardless of the terrain you are confronted with. This seems to make it very hard to remove the possibility to apply certain methods (cf. the various iterations of Jailbreak).
Definitely not if you have Nepster testing. He's pretty much the master of backrouting levels. 
Thanks, but it is likely that I am just spending much more time (read: too much time) on solving/backrouting levels here.
