You ended up breaking my r2. It's definitely easier than my average r2s, but not like this.
My rule3 is intended to be an open-ended level. But surprisingly you found almost same solution as mine! The main idea of the level is that you can make a lemming tri-athlete and give rest of the lemmings one permanent skill each.(5+5+5+1=16)
So any solutions that send a worker lemming(tri-athlete) from top hatch(which is the only hatch that spawn 6 lemmings) and prepare safe falls for the 3 athletes groups, I would consider acceptable.
Well done!
I think my r2 is easier than r3, so it's won't be a problem to you.