Upgrade path

Purple Iron Door→ 1× Steel Door →Steel Door

Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 6 hits per upgrade.

Crafting

Craft at Backpack · makes 1

Crafted as Iron Door: pick this one of its variants when you place it.

Harvest drops

Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.

Drops when destroyed

When it collapses

Falling, it leaves Scrap Metal Pile (75% of the time) where it lands.