This trick could potentially be useful for any level involving an opposite facing exit, blockers, bashers and lots of spare builders. I used it to solve
Lunatic 26 in just
52 seconds.
Replay is attached to the zip file.
Other results this evening so far are:
Manic 26: 0:56.47 (Similar to the published solution but uses an extra blocker)
Zany 24: 0:35.88 (Because there are 100 lems and a 99 release rate I wanted to find a quicker way to let the last lemming reach the exit. I had to build towards the entrance but also needed to find a way redirect the builder towards the exit before the last lem arrives.)
I also fixed an error to
Zany 25. The result is
1:04.94.