Background walls/draft

For the wall-like background textures present in underground biomes, see Biome backgrounds § Underground backgrounds.

**Background walls**, also just known as **walls**, are tiles that create backgrounds on top of biome backgrounds. Walls are hidden behind everything else, such as blocks. 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 can be removed with a hammer or explosives. Flammable walls can also be destroyed by fire or lava. There are currently 250 obtainable walls.

Walls can be placed on any tile which does not already contain a wall, if it is adjacent to another wall or block. Placed walls are either "safe" or "unsafe".

Certain mechanics of walls are dependent on if they are "safe" or "unsafe":

* **Safe walls** prevent enemies from spawning (but do not prevent their passage), and a mostly unbroken background of safe walls is necessary for a structure to qualify as an NPC house, or to use a Bed to change a player's spawn point.
	+ 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.
* **Unsafe walls** will not stop enemies from spawning, and cannot be utilized for houses.
	+ Most unsafe walls are naturally generated, and when broken, will either drop their safe equivalent or nothing at all.
	+ They can only be removed by starting from their edge (i.e., adjacent space with no wall), which for explosives means that an edge must exist somewhere within the radius of the explosion.
	+ Walls that are converted via biome spread or the Clentaminator/Terraformer are considered unsafe, even if they were previously safe.
	+ Some safe walls can be transmuted into unsafe walls by dropping them into Shimmer. These transmuted walls will be prefixed with "Cursed", "Forbidden", "Infested", or "Treacherous". Once placed, these walls will drop their "safe" form if removed by the player.

Distinguishing safe walls from unsafe walls can be tricky because many walls, such as Obsidian Brick Walls or Dungeon Brick Walls, exist in both safe and unsafe forms. With these walls (both of which are harvestable), the player must break the unsafe walls and replace them in order for them to count as safe walls. Similarly, many (or all, on ) naturally-generated walls have safe counterparts which are obtainable through crafting or purchase from NPCs.

## Types

### Crafted walls

These walls are made by the player using various crafting materials. All crafted walls qualify for housing.

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### Purchased walls

These walls are purchased from various NPCs. All purchased walls qualify for housing.

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### Harvested walls

These walls can be harvested in various places when exploring the world. Most of them can also be obtained through crafting. All harvested walls qualify for housing.

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### Converted walls

These walls are normally created by biome spread. They can also be made using Solution sprayed with the Clentaminator, and on the PC version, Console version, Mobile version, and tModLoader version they can also be crafted or purchased (with the exception of the natural Mushroom Wall). On the Old-gen console version, Windows Phone version, Old Chinese version, Nintendo 3DSversion, and tModLoader 1.3-Legacy version the Clentaminator is the only way the player can make these walls. These walls qualify for housing when they are crafted or purchased, but not if they are created by biome spread or the Clentaminator.

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## Shimmered walls

These walls are transmuted by dropping them into Shimmer. Once placed, the transmuted walls are "unsafe", and do not qualify for housing. The "unsafe" walls will drop their "safe" form if removed by the player.

Blue, Green, Pink, Lihzahrd, Sandstone, Hardened Sand, Spider

## Notes

* Dirt Walls generally completely cover the background at Underground depths above zero (*see Layer, Depth Meter*). Placing new walls in this area would require first tearing down the existing walls starting from the top (the Surface) or the bottom (zero depth), which can be an arduous task. Alternatively, the existing walls can be destroyed using explosives.
* At depths below zero, the backdrop of the map is generally no longer covered with actual wall tiles, though this can be difficult to differentiate visually since the biome background at these depths can have a similar appearance. Walls can be placed freely here by players.
* Torches and several other furniture items can be placed directly on background walls without requiring blocks below them.
* Most walls have no coin value, even if they were crafted from rare materials. Stained glass and wallpaper bought from the Painter are exceptions.
* Walls appear to have their own placement layer.

## See also

* Wall IDs
* Blocks

## History

PC version
* Desktop 1.4.0.1: Made several wall types craftable that were previously unobtainable through the use of Ecto Mist.

* Desktop 1.3.1: Most wall inventory sprites updated. Which ones were not are currently unknown.

* Desktop 1.3.0.5:
	+ Living leaf walls are valid for housing

* Desktop 1.3.0.4: Fixed walls not framing properly in camera mode snapshots.

* Desktop 1.3.0.1:
	+ Bug fixed: The Blue Slab Wall is now valid for housing if placed by a player.
	+ Added Honeyfall, Granite, Smooth Granite, Marble, Smooth Marble, Chlorophyte Brick, Shroomite Plating, Martian Conduit, Luminite Brick, Meteorite Brick, and Crimtane Brick walls.
	+ Many naturally generated walls have a new appearance.
	+ Now you can place walls in front of each other.

* Desktop 1.2.4.1:
	+ The Sail now costs 50 instead of being free.
	+ A bug affecting the appearance of placed Tin Plating Walls (view) has been fixed.

* Desktop 1.2.4:
	+ Adding walls made from Gemspark Blocks, Palm Wood, Boreal Wood, 1.2.3-Heavy Work Bench-products, and Glass+Confetti.
	+ The Pirate now sells the Sail.
	+ Two natural cave walls (7 and 8) have been added. Gemstone Cave- and Moss Cave-walls have received an overhaul.
	+ The Metal Fence has been split into Lead and Iron variants.
	+ The Lavafall Wall and Waterfall Wall are now crafted like most other walls.
	+ Painted walls show up properly on the map.

* Desktop 1.2.3: Adding Dynasty Walls, Lavafall Wall, Waterfall Wall, even more Wallpaper, and the Portable Cement Mixer for even heftier wall placing.

* Desktop 1.2.2: Ten new holiday-themed wall types called Wallpaper can now be purchased from the Painter.

* Desktop 1.2.1: Fixed an issue causing walls to not have different frames. Pumpkin Wall, Hay Wall, and Spooky Wood Wall added.

* Desktop 1.2.0.3:
	+ Lihzahrd Wall added.
	+ You can now craft living wood walls.
	+ Snow particles will no longer spawn on backwalls.

* Desktop 1.2:
	+ Torches can now be placed directly onto walls.
	+ Each brick wall now has its own unique texture.
	+ Several new wall types added.

* Desktop 1.1.1: Added Snow Brick Wall, Candy Cane Wall, Green Candy Cane Wall

* Desktop 1.1: Added Glass Wall, Planked Wall, Mythril Brick Wall, Cobalt Brick Wall, Mudstone Brick Wall, Iridescent Brick Wall and Pearlstone Brick Wall.

* Desktop 1.0.6.1: Walls that are automatically placed to fill small gaps are now correctly taken from the player’s Inventory.

* Desktop 1.0.6: When placing background walls, one-block holes are now automatically filled in.