自然墙壁 are instead found throughout the world in several Biomes, and cannot be placed by players. Natural walls will not stop enemies from spawning, and cannot be utilized for Houses. These walls must be removed by starting from their edge (i.e., there must be at least one adjacent tile with no wall), unlike housing walls, which can be removed from any point. Explosives can remove all natural walls within their blast radius as long as an edge is somewhere within the radius.
Walls can be found naturally in several Biomes. Naturally occurring walls will not stop enemies from spawning, and cannot be utilized for Houses. They must be torn down and placed manually in order for a House to occupy the space. All naturally occurring walls must be removed by starting from their edge (i.e., there must be at least one adjacent tile with no wall), unlike player-placed walls, which can be removed from any point. Explosives can remove all natural walls within their blast radius as long as an edge is somewhere within the radius.
Walls are generally obtained via crafting, purchasing from NPCs, or by harvesting naturally-occurring walls. One item of crafting material generally crafts four of its corresponding Wall items. As of version 1.2, four of the same wall item can also be crafted back into one of the items it was made from.
- 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 Dynamite.
- 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 background image 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.
- Walls have no coin value, (excluding wallpaper bought from the Painter) even if they were crafted from rare materials.
These walls are made by the player using various crafting materials.
These walls are mainly created when the Corruption, Crimson, or Hallow naturally spreads to them, but they can also be made by using the respective Solution with the Clentaminator. When destroyed, these walls do not drop anything. This technically makes them unobtainable.
These walls are spawned when the world is created but are unable to be created, obtained, looted, purchased, or used by the player in any way*. They can be destroyed, but drop nothing (with one exception).
*Unobtainable walls can be utilized with third-party map editors such as TEdit.
1.3.1：Most wall inventory sprites are updated.
- Living leaf walls are valid for housing
220.127.116.11：Fixed walls not framing properly in camera mode snapshots.
- 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.
- The Sail now costs 50 instead of being free.
- A bug affecting the appearance of placed Tin Plating Walls (view) has been fixed.
- Adding walls made from Gemspark Blocks, Palm Wood, Boreal Wood, 1.2.3-Heavy Workbench-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.
- Lihzahrd Wall added.
- You can now craft living wood walls.
- Snow particles will no longer spawn on backwalls.
Torches can now be placed directly onto walls.
- Each brick wall now has its own unique texture.
- Several new wall types added.
18.104.22.168：Walls that are automatically placed to fill small gaps are now correctly taken from the player’s Inventory.
1.0.6：When placing background walls, one-block holes are now automatically filled in.