Tricky 14 ("MENACING !!"), no more than 1 skill per lemming
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This level has 3 parts:
  A) The first island where lemmings entered onto.
  B) The gap between the first and second island.
  C) The second island, above which floats the exit platform.

Part A is easy: just block on the left, and keep bashing until you get through
all obstacles.

Part C is also easy:  as soon as a lemming from the crowd reaches the island,
have him block to keep lemmings from falling off on the left.  Then start
building the bridge to the exit.  This only takes about four and a half builders,
so there's no danger of the fall off the bridge ever being too high.  Once the
bridge has gone far enough right so that there's a danger of the crowd falling
off the right edge of the island, have someone from the crowd block to prevent
that as well.  Use bashers to bash through those tall tentacles to allow lemmings
blocked by them to go back onto the exit bridge.

This leaves part B, where we use the "controlled release" technique.  Start off
by having a lemming build to the right somewhere around the right end of the
first island (but still well within its grounds), and another block on the 
ground, below where the end of the builder's bridge would be at.  See screenshot 
A.  The idea is that when the builder finishes building, the top of the bridge 
would be above the head of the blocker, so that lemmings falling off it will get 
past the blocker.

As soon as one lemming go over the bridge and past the blocker, mine the bridge
to break it, preventing other lemmings from following.  Make sure you mine at a
position that leaves a little bit of the top end of the bridge intact. See 
screenshot B. The lemming that we "control-released" past the blocker will work
on the bridge over the gap.

When you need another lemming to work on the bridge over the gap, have a lemming
build to seal the gap created by the miner, and then as soon as one lemming has
gotten past the blocker, have another lemming mine to break the bridge again.
For the builder that seals the previous miner gap, if you make him start building
from the very edge of the gap, he will eventually bump into the unmined upper 
portion of the bridge and turn around.  See screenshots C thru E.

Repeat the procedure until you've completed 3 bridges over the gap, stretching them 
as fully as possible.  You need 1 more bridge to fully get over the gap, but for 
the 4th bridge, there's no need to hold back the crowd, because one build brick is 
enough to reach the second island.

Altogether, 4 blockers are used.  The final basher for the first island, the first
3 builders over the gap, and the builder that goes over the blocker's head, they
all have to be sacrificed once they've done their jobs.  So this solution loses a
total of 9 lemmings, which is okay since you are allowed to lose 10.  The total 
number of builders used is only 13: 4 for the gap, 5 for reaching the exit, 1
for the "bridge over the blocker's head", and 3 more for the 3 times you need to
reseal that bridge (ie. after the completion of the 1st, 2nd and 3rd bridges over
the gap).