Unsafe walls will not stop enemies from spawning, and cannot be utilized for houses.

Unsafe walls are a type of wall that appears during world generation, and can generally not be utilized by the player when broken, they will either drop their safe equivalent or nothing at all.

Safe walls are usually obtained from crafting, or purchased from NPCs, but can also be found naturally in certain structures, such as Shrines and Pyramids.

Safe walls prevent enemies from spawning (but do not do anything to prevent their passage), and a mostly unbroken background of safe walls is necessary for a structure to qualify as a NPC house, or to use a Bed to change a player's spawn point.

Certain mechanics of walls is dependent on which of the following categories they fall under: Many wall types exist as items that the player can place in their inventory and then re-place in any area which does not already have walls. There are currently 250 obtainable walls. Flammable walls can also be destroyed by fire or lava. Walls can be removed with a hammer or explosives.

Natural walls are generated at world creation, being abundant in certain biomes like the Underground Jungle, and are of the main components a Terraria world consists of alongside blocks and liquids. Walls are hidden behind everything else, such as blocks. For the wall-like background textures present in underground biomes, see Biome backgrounds § Underground backgrounds.īackground walls, also just known as walls, are tiles that create backgrounds on top of biome backgrounds.

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