These areas are open to any player. Adult themed activities are prohibited from the social areas. The Adult Area is defined as areas where most anything goes that is consensual with any others involved. Access to this area is limited to those who are over 18 years of age. Building on most mucks is a given.
Players can build.
Here, players automatically have this capability, but start with small quotas. These can be increased by showing good building skills. Coding is another aspect, often referred to as MUF or M bits, or Muckers. MUF is Muck Forth, a programming language. The Theme of this muck is a reasonably modern day era, with some technology, and a lot of the olden days still in evidence.