corruption spread prevention, Terraria, sunflowers, purification powder, Dryad NPC, Holy Water, Clentaminator, Green Solution, digging trenches, 6-tile-wide gaps, lining with non-corruptible blocks, wood, clay, dungeon bricks, creating artificial biomes, Hallow, Jungle, building on the sky or ocean, in-game mechanics, strategic gameplay, environmental control, landscape management, block replacement, biome conversion, player action, game strategy, corruption containment, effective barriers, maintaining world purity, careful construction.