Plan a Corruption, Crimson, or Hallow Cleanup with TerraWorld

Start with a backup and a map review

Corruption, Crimson, and Hallow can spread through connected terrain. TerraWorld can help you inspect a local world map and make available tile edits, but it cannot confirm an in-game achievement or a Dryad percentage for you. Make a backup of the .wld file before changing anything.

Step 1: Load the world and inspect the terrain

1. Open your local save in TerraWorld Editor.
2. Use the map, Search panel, and available world-analysis views to inspect areas you suspect are infected.
3. Zoom into the surrounding terrain before editing. Nearby grass, stone, sand, ice, walls, and player-built structures can need different treatment.

Step 2: Mark an editing plan

Use search results as clues rather than proof that an entire biome is clean. Record important coordinates or export a map image for reference. For a large or unfamiliar area, test a small section first instead of changing a broad region at once.

Step 3: Make small, deliberate edits

1. Open Edit Mode and select a tool such as Pen, Brush, Bucket Fill, or Erase.
2. Choose the target layer: tile, wall, or both. Select the tile or wall you intend to place before drawing.
3. For the Brush, set a size between 1 and 10 tiles, then work in small passes so you can inspect the result.
4. Use undo if you change the wrong area. Avoid editing structures or wiring unless you understand the impact in Terraria.

Step 4: Export and verify in Terraria

Use Export World to download a separate world file. Keep the original backup, place the exported file in a test location, then load it in Terraria and verify the terrain and any biome progress in-game. Do not overwrite your only save until you are satisfied with the result.