Another bad thing about "Watch your step is that you don't need all the builders -- it can be done with just eight, maybe even seven. That's a lot of room for accident, more than you expect in a Sunsoft level.
Sunsoft 6: Libra
15 bombers, 15 blockers (despite what the site says!)
To save 80% of 60
Release rate 50
5 minutes
Good: it's so fun to blow the little critters up!
Bad: Yet again, very little puzzle. And you're given quite a bit of leeway in that you can lose twelve lemmings, but it can be done with (I think) nine bombers.