🌳 Terraria World Workshop • Episode 4 of 12 • See All Episodes
🌳 Episode 4 · Beginner · Walls & Layers

Build Your Own Terraria World
Episode 4: Walls & Layers

Every space in Terraria has two layers: the tile you stand on and the wall behind it. Once you can tell them apart, you can build a room that keeps the dark and the enemies out.

👶 Ages 10+ ⏱️ ~45 Minutes 🌳 Terraria ✓ Free workshop
🧱 Foreground 🖼️ Background walls 🖌️ Wall brush 🏠 Safe rooms ⛏️ Natural walls 🪜 Depth
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Ember says: walls are the quiet hero of building. They do not block you, but they turn an empty hole into a real room where nothing nasty spawns. Get this layer right and everything you build later feels safe.
🛠️
Try it right here: turn on Wall mode and paint behind a tile, so the second layer becomes obvious. This is the real Terraria World Studio, live in this page. Open it full size →
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Two Layers
The tile you stand on, and the wall behind
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Goal for this step

See a world as a front layer and a back layer, stacked on every square.

  • 1The foreground is the tile you can stand on or bump into: grass, dirt, stone, wood.
  • 2The background wall sits behind that tile. It does not block you at all, you walk straight past it.
  • 3The wall is what makes a space count as a room, and it is what stops enemies spawning inside.
  • 4Every square can hold one foreground tile and one background wall, neatly stacked.
Two stacked layers
BACK    [ wall  ][ wall  ][ wall ]   behind everything
FRONT   [ stone ][ stone ][ wood ]   what you stand on
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Fill in the Blanks
+15 XP
The tile you stand on is called the layer. The wall sits it.
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Knowledge Check
+15 XP
What is the layer you stand on called?
AThe foreground layer
BThe background wall
CThe sky layer
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Placing Walls in TEdit
Switch to the wall brush
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Goal for this step

Learn the wall brush, the tool that paints the back layer.

  • 1In TEdit you have two brushes: one for foreground tiles and one for walls.
  • 2Switch to the wall brush to paint the layer behind the tiles.
  • 3A wall can sit behind a solid tile too. You will not see it until you dig that tile away.
  • 4This is just like the Wall mode button in the browser Studio, so try it there first if you like.
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Fill in the Blanks
+15 XP
In TEdit, switch to the brush to paint the layer behind the tiles.
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Knowledge Check
+15 XP
How do you place a wall in TEdit?
AUse the same brush as tiles
BSwitch to the wall brush
CDelete the foreground tile first
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Make a Safe Room
Walls keep enemies out
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Goal for this step

Turn an empty space into a safe room by filling it with walls.

  • 1Dig out a small room, a few tiles wide and tall, down in the ground.
  • 2Switch to the wall brush and fill the whole room with walls, floor to ceiling.
  • 3Every open square needs a wall. One bare square is enough for an enemy to sneak in.
  • 4Drop in a torch and a door, and you have a safe little room to call home.
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Fill in the Blanks
+15 XP
Walls make a space count as a . A room with walls is from enemies.
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Knowledge Check
+15 XP
What makes a space count as a room?
AA torch in the corner
BBackground walls on every square
CA chest on the floor
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Natural Walls Underground
Dirt and stone walls already there
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Goal for this step

Understand the natural walls the world already placed for you.

  • 1Underground, the game already places natural walls: dirt walls near the top and stone walls deeper down.
  • 2These natural walls are why most caves do not spawn enemies on every single tile.
  • 3You can place a natural wall yourself by picking dirt wall or stone wall with the wall brush.
  • 4Natural walls look rougher than crafted walls, so you can always tell them apart.
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Fill in the Blanks
+15 XP
Underground, the game places natural walls near the top and walls deeper down.
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Knowledge Check
+15 XP
Which natural walls does the world already have underground?
ADirt and stone walls
BGlass walls
CWood walls
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Common Wall Mistakes
Missing walls, or walls you did not want
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Goal for this step

Spot the two wall mistakes and know how to fix each one.

  • 1Mistake one: a missing wall. One bare square and enemies can spawn right inside your room.
  • 2Mistake two: walls where you do want enemies. An enemy farm needs open squares with no walls.
  • 3To fix a missing wall, switch to the wall brush and fill that bare square.
  • 4To let enemies spawn on purpose, remove the wall with the eraser and leave the square bare.
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Fill in the Blanks
+15 XP
A wall lets enemies inside your room.
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Knowledge Check
+15 XP
You want enemies to spawn in a farm. What do you do with the walls?
AFill every square with walls
BLeave the squares without walls
CAdd more torches
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Layers and Depth
Surface rooms vs underground rooms
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Goal for this step

Use depth to decide where a room belongs and how it should feel.

  • 1The surface is the top layer of the world, where you spawn and can see the sky.
  • 2Underground rooms sit below the surface, tucked inside dirt and stone.
  • 3Surface rooms feel bright and open. Underground rooms feel cosy and safe.
  • 4Plan for the depth: big windows up top, tight walls and lamps down below.
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Fill in the Blanks
+15 XP
Rooms on the top of the world are rooms. Rooms tucked below are rooms.
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Knowledge Check
+15 XP
Where do underground rooms sit?
AAbove the clouds
BBelow the surface
CIn the middle of the ocean
🎉🧱🏠✨🎉
You Understand Walls & Layers!
You can tell the front tile from the back wall, place walls in TEdit, and build a room that keeps the dark and the enemies out. Episode 5 shows how the blocks around a place turn it into a biome.
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Safe Room Order
+20 XP
Drag these into the right order to build a safe room.
Load the world and check it feels safe
Dig out the room
Add a door and a torch
Place a background wall on every square