Base Defense Layouts

Wall shapes, tower mixes, and the ammo and power that keep them firing. How to stop waves from overrunning a base that looks like it has enough towers.

At a glance


The threat	Periodic waves of aliens beeline for your structures. Bigger, higher-tech bases draw bigger waves, including Omega bosses.
Walls	Two or three layers with gaps, shaped into a star fort or cross to funnel enemies into kill zones.
Towers	Layer by range: anti-swarm up front, AoE and armor-piercing at the back.
The catch	Towers fire until ammo runs out, then go inert. Ammo and power are the real defense.

The single most common way a defended base falls is not too few towers. It is towers that ran dry, or buildings that lost power and shut down.

Wall shapes

Use two or three layers of walls with gaps between them. Many large enemies do AoE damage, and spacing the layers limits how much wall a single hit removes.
Build a star fort or cross shape. It funnels enemies into minefields and gives towers overlapping fields of fire.
Use protruding, jagged outer walls to reduce the surface area enemies can hit at once.
Find where waves beeline (map edges and the shortest paths to your base) and concentrate defenses and corners there.

Tower composition

Layer by range and damage type:

Position	Towers	Job
Front	Flamer, Minigun, basic gun towers	Shred small, fast swarm enemies
Mid	Medium-range damage	Hold the middle
Back	Artillery, Heavy Artillery, Railgun	AoE on big targets; Railgun punches through front targets to hit rear ones

A practical baseline mix is Artillery plus Railgun plus Minigun: AoE, armor-piercing single-target, and rapid anti-swarm together. Add Radar to extend artillery range.

World Expansion IV added three more options: the Icicle Tower (cryo projectile that slows an area), the Inferno Tower (mid-range cluster fire that ignites the ground), and the Shredder Tower (rapid acid needles that split on impact, mainly single-target).

Do this in order

Wall in layers with gaps and shape the base into a star fort or cross.
Place anti-swarm towers (Flamer, Minigun) on the front line where waves arrive.
Place Artillery and Railgun at the back, with Radar to extend range.
Build Tower Ammo Factories proportional to your tower count and feed them Carbonium and Ironium.
Confirm energy production exceeds total draw so nothing shuts down mid-wave.

Watch out for

Towers without ammo. They stop firing and become decorations. Scale Tower Ammo Factories with your tower count, and since 2.0 the Armory is capped at one building, so upgrade it the moment each level unlocks.
Energy falling below draw, which cascades into shutdowns across the base.
One thick wall instead of spaced layers. AoE hits delete stacked walls at once.
Over-expanding, which silently raises wave size against you.