Builder is a skill that can be given to a Lemming. It is the fifth of the eight skills available in Lemmings, as well as the Classic Tribe in Lemmings 2. Builders create a diagonal staircase upwards, consisting of twelve bricks. Once a Builder runs out of bricks, he will shrug his shoulders and continue walking. You can make him build again by selecting him before he walks off the bridge. The lemming will stop and turn back if it bumps into a wall or ceiling. The builder is notable as being the only Classic skill capable of adding terrain to the level, and as such features heavily in solutions to many levels.