🌳 Terraria World Workshop • Episode 5 of 12 • See All Episodes
🌳 Episode 5 · Beginner · Biomes & Rules

Build Your Own Terraria World
Episode 5: Biomes & Rules

A biome is not painted on a map. The game counts the blocks around you and decides where you are. Once you know the rule, you can invent your own places: a desert, a snowfield, a jungle.

👶 Ages 10+ ⏱️ ~45 Minutes 🌳 Terraria ✓ Free workshop
❄️ Biomes 🧱 Block counts 🏜️ Desert & Snow 🖌️ Biome patch 🎵 Music change 🔧 Fix a biome
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Ember says: here is the secret of biomes: it is just a rule. Put enough of the right blocks in one place and the game does the rest. If it does not work, your blocks were too few or too far apart.
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Try it right here: paint a patch of sand or snow. Enough sand reads as a Desert, enough snow as a Snow biome. This is the real Terraria World Studio, live in this page. Open it full size →
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What a Biome Really Is
A region counted from the blocks around it
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Goal for this step

Understand a biome as a count of the blocks near your player.

  • 1A biome is a region of the world with its own look, its own music and its own enemies.
  • 2The game does not draw biomes on a map. It counts the blocks around your player.
  • 3Pile up a lot of sand in one area and the game decides you are in a Desert.
  • 4So a biome is really a rule: enough of the right blocks, close enough together.
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Fill in the Blanks
+15 XP
A biome is decided by counting the around an area. Lots of sand makes a .
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Knowledge Check
+15 XP
How does the game decide which biome you are in?
AIt counts the blocks around you
BIt asks you to pick one
CIt rolls a dice
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Block Requirements
Sand makes Desert, snow makes Snow
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Goal for this step

Learn which blocks make which biome.

  • 1Each biome needs a lot of its own blocks in one area before it appears.
  • 2Lots of sand makes a Desert. Snow and ice make a Snow biome.
  • 3Jungle grass and mud make a Jungle. Corrupt and crimson blocks grow their own biomes.
  • 4The blocks have to be close together. A few tiles dotted far apart will not count.
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Fill in the Blanks
+15 XP
Lots of makes a Desert, and and ice make a Snow biome.
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Knowledge Check
+15 XP
Which blocks make a Snow biome?
ASand and cactus
BSnow and ice
CMud and jungle grass
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Place a Biome Patch
Paint the blocks in TEdit
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Goal for this step

Paint a patch of biome blocks big enough to count.

  • 1In TEdit, pick the block you need, like snow, ice or sand.
  • 2Paint a patch of it along the surface, wide and thick enough to count.
  • 3One or two tiles is not a patch. Aim for about a room-sized block of it.
  • 4Keep the patch together, not dotted around, so the count really adds up.
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Fill in the Blanks
+15 XP
In TEdit, paint a of biome blocks, wide and thick, all close together.
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Knowledge Check
+15 XP
How big should a biome patch be?
AOne single tile
BA generous area, all close together
CAny size at all, it always works
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Test the Biome in the Game
The background and music change
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Goal for this step

Confirm your biome by its look and its sound.

  • 1Save the world in TEdit, then load it back in the game.
  • 2Walk into your patch. The background changes to match the biome.
  • 3The music changes too. Each biome has its own tune.
  • 4If the sight and the sound change, your biome is working.
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Fill in the Blanks
+15 XP
When a biome triggers, the and the change.
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Knowledge Check
+15 XP
What changes when you step into a working biome?
AThe background and the music
BYour character's name
CThe size of the world
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Biome Size and Boundaries
A few tiles is not enough
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Goal for this step

Learn how size and edges decide whether a biome shows up.

  • 1A biome needs enough blocks to cross a hidden threshold. A few tiles will not do it.
  • 2The bigger the area, the more reliably the biome triggers.
  • 3Biomes have soft edges. The change happens gradually as you walk in.
  • 4If two patches sit close together they can blend, so leave room between different biomes.
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Fill in the Blanks
+15 XP
A biome needs enough blocks over a wide enough . If the patch is too , it will not trigger.
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Knowledge Check
+15 XP
Why is a few tiles not enough to make a biome?
AThe game needs the area to be dark
BThere are not enough blocks to pass the threshold
CTiles must be underground
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Fix a Biome That Will Not Trigger
Check the blocks and the count
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Goal for this step

Fix a biome that stays stubbornly plain.

  • 1If nothing changes, check you painted the right block. The wrong block does nothing.
  • 2Make sure the blocks are dense enough and close together, not scattered.
  • 3Check the blocks are somewhere that counts, not buried far out of reach.
  • 4Save, reload the world, then walk in again to test. Repeat until it works.
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Fill in the Blanks
+15 XP
A stubborn biome may need more , close together, before it will .
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Knowledge Check
+15 XP
Your biome patch does nothing. What is a likely cause?
AThe blocks are too few or too far apart
BThe music is too loud
CYou need to buy the game again
🎉❄️🏜️✨🎉
You Can Build Biomes!
You know a biome is a rule about the blocks around you, and you can place one, test it and fix it. Episode 6 brings everything together to build and decorate a place of your own.
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Biome Build Order
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Drag these into the right order to make and test a biome.
Load the world back in the game
Paint a patch of the right blocks
Walk in and check the music changes
Save the world