Wall

Walls are a defensive structure that prevents both the player and enemies from passing. They can be used to shield turrets so they will be able to fight enemies longer without being destroyed, and can be used to protect parts of the factory from enemies. Although walls have less health than most defensive structures, their high damage resistance means it will take longer for enemies to destroy them.

Gates can be constructed to allow the player to pass through walls. Gates share the same health and resistances as walls and automatically close for enemies if not connected to the circuit network, so no defensive power is lost.

Walls only block melee attacks, projectile attacks go over them. However, big and behemoth biters can attack 2 tiles away, meaning they can hit structures directly behind a single layer of walls. To prevent this, structures can be moved further back from the walls or a second layer of walls can be added.

Despite their applications as a defensive measure, walls are not considered a military unit and structure; this is important for understanding the behavior of enemies regarding walls. If they are attempting to attack something and the wall obstructs their path, they will attack the wall to destroy it and clear the way. However, if they have already been aggro'd by a turret or the player, enemies will more actively pursue their aggressor and not necessarily attack walls between them. This allows the player to stall enemies more efficiently by buildin