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A guide on how to make artificial biomes in Terraria.
Artificial Biomes Guide
Overworld Jungle
You will need at least 80 Mud Blocks with Jungle grass on them to make this biome. The music and background should automatically change after all the grass has spreaded.
Overworld Snow
You will need at least 300 Snow Blocks, Snow Bricks, and or Ice Blocks to make this biome. The music and background should automatically change.
Overworld Corruption
You will need at least 200 Grass Blocks, Ice Blocks, Stone Blocks, and or Sand Blocks with Corruption grass to make this biome. The music and background should automatically change after all the grass has spreaded.
Overworld Crimson
You will need at least 200 Grass Blocks, Ice Blocks, Stone Blocks, and or Sand Blocks with Crimson grass to make this biome. The music and background should automatically change after all the grass has spreaded.
Overworld Hallow
You will need at least 200 Grass Blocks, Ice Blocks, Stone Blocks, and or Sand Blocks with Hallowed grass to make this biome. The music and background should automatically change after all the grass has spreaded.
Overworld Meteorite
You will need at least 50 Meteorite Ore to make this biome. The music and background should automatically change and Meteor Heads will begin spawning.
Overworld Mushroom
You will need at least 100 Mud Blocks with Glowing Mushroom grass on them to make this biome. The music and background should automatically change after all the grass has spreaded.
Overworld Dungeon
You will need at least 250 colored Dungeon Bricks and or Dungeon Walls to make this biome. The music and background should automatically change. However, Dungeon Walls must be natural and cannot be made with the ones that a player crafts.
Side note: I have never actually tried to make this myself, so I don’t know if this is still possible or has ever been possible.
Lihzarhd Temple
You will need at least 80 Lihzarhd Bricks and Lihzahrd Walls to make this biome. The music and background should automatically change, with Flying Snakes and Lihzahrds to begin spawning.
That’s it for now. Currently, these biomes are not mentioned yet: Ocean, Spider Nest, Underworld, Underground Desert, Desert.