In Terraria Hardmode, Corruption can convert susceptible blocks up to three tiles away from a spreading tile. That is a local spread radius—not a guarantee that any three-tile gap will contain it: walls have a shorter range, and thorny bushes or vines can bridge openings.
How far can Corruption jump?
“Jump” is an informal way to describe biome spread. In Hardmode, a spreading Corruption tile can convert susceptible blocks within a 7×7 area centered on it, reaching up to three tiles in each direction. The Official Terraria Wiki’s biome-spread guide describes this block-conversion range.
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Does Corruption spread to walls as far?
No. Background walls have a two-tile infection range, described as a 5×5 area around the source tile. Treat wall infection separately from block conversion when planning a barrier.
How does spread differ before and during Hardmode?
| Game state or target | Spread rule |
|---|---|
| Pre-Hardmode blocks | The listed spreading grass and thorny bushes can spread only to directly adjacent blocks. |
| Hardmode blocks | Susceptible blocks can be converted within three tiles of a spreading tile. |
| Walls | Infection reaches walls within two tiles of the source tile. |
After defeating the Wall of Flesh, spread becomes faster and more aggressive. Defeating Plantera for the first time reduces Corruption spread speed by 50%, according to the Official Terraria Wiki’s The Corruption page. The wiki lists the biome as applying to Desktop, Console, and Mobile; these figures are wiki-described game mechanics, not independent test results.
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Is a three-tile gap enough to stop Corruption?
It can stop ordinary three-tile block conversion only if infection-capable vegetation cannot grow across the opening. Thorny bushes can extend across gaps, and vines can spread a biome to nearby blocks and walls in Hardmode. Check and clear growth along the barrier’s edges rather than relying on the measured empty space alone.
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