Well, I guess I will obfuscate it, although it isn't a big deal:
(Optional) Use 2 blockers at the top, and trap one lemming in between them. This makes it easier to free the crowd at the end. (Free the blocker to the left, which will be ahead of the crowd, who then frees the blocker to the right.)
Make the first lemming a floater. Build over the exit and hit the wall to the right (2x builders). Make the floater an athlete and climb over the pillars to the left. Build once to the left wall, then build once to the right to the large brick area. Bash through this, then build at the end to make a safe step for the rest of the lemmings. Free the blocker(s), and bash through the steps that you had to create to turn around initially.
That was the original solution, although there's also an alternate solution that uses more floaters and blockers but takes less time. (I didn't remove the possibility for that since it's only Level 2, and I wanted an easy warm-up kind of level.)
Now I wonder, with those tools, what is your solution?
