On: Lemming Suicide Myth: Disney Film Faked Bogus Beha...

[bombcar]

All the levels are solvable - the trick is many are solvable with losing zero lemmings, even though it seems you must lose at least one.

[garaetjjte → bombcar]

Most important tricks: blocker is released when terrain below it is removed, builder that hits terrain reverses direction, and multiple builders in a row can make staircase thick enough to be impassable from the other side.