Perimeter Zero

Something has landed on the Moon.

A huge alien mothership sits on its near side, and every month it launches a fleet at Earth. Its target is the Command Nexus, the last command centre on the planet. Hold it for one year.

Sci-fi Tower Defense is a tower defense game drawn in glowing neon line art. Every building needs its own cables, every tower needs power and ammo, and every enemy wreck is scrap your drones have to go and collect.

HOW IT PLAYS

Each month has two turns:

• Build Turn: spend Iron on towers, generators and support buildings, then run underground cables between their ports. Take your time.
• Attack Turn: call the wave in. Ships launch from the mothership, boost across space and dive onto your base. Your towers fire on their own, so what you built has to work.

Survive twelve months to win.

GAME MODES

• Tutorial: a guided first month that teaches every system one step at a time, from placing your first tower to cabling power and ammo to surviving a wave.
• Normal: start with a working base already built and cabled: towers, an Ammo Depot, a Repair Bay, a Salvage Depot and power generation.
• Hard: start with only the Nexus and build everything yourself.