Background walls

Walls are the backgrounds of buildings. All walls except for dirt walls prevent enemies from spawning, and a room filled with 'safe walls' is necessary in order to attract NPCs or to use a bed to set the spawn point.

Walls may be removed with a hammer, but only walls on the edge of an existing wall may be removed.

At positive elevations, dirt walls are the mainstay of the map. Dirt walls must therefore be removed from either the top or bottom edges of the zone of positive elevation, making the construction of safe houses in the center of the dirt zone a fairly lengthy task.

At negative elevations, the backdrop of the map is no longer dirt and walls of the player's choice may be placed on the backdrop freely.