Under Domain - Alien Invasion Simulator — Steam capsule
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Under Domain - Alien Invasion Simulator Free Download

by Playlearn

Windows · Oct 21, 2020

Download Now Data checked on Steam: Oct 20, 2026
Fit check

Is Under Domain - Alien Invasion Simulator worth it for you?

We tell you who should skip it, too.

Play it if you…

Good fit
  • Strategy players who want to lead an alien invasion rather than defend Earth
  • Turn-based players who enjoy planning actions across a historical timeline
  • Science-fiction fans interested in developing a mothership and preparing a fleet

Skip it if you…

Saves you a refund
  • Players seeking immediate, continuous combat may find the covert planning and fleet preparation phases slow the pace.
  • Players who want a timeline extending beyond 2020 may find the historical scope limiting.
  • Players who prefer to command human defenders may not enjoy taking the role of the invading aliens.
  • Players looking for real-time strategy may not enjoy the turn-based structure.

Drafted from Steam store data with AI and reviewed by an editor · How we write fit checks · Report an error

Our take on Under Domain - Alien Invasion Simulator

Players may hit a wall when covert actions draw human attention: the game says sightings can lead nations to prepare for an attack and raise the invasion's difficulty. The planning also involves gathering resources, choosing mothership development paths, and positioning ships before combat.

What is Under Domain - Alien Invasion Simulator?

Under Domain is a turn-based strategy game about leading an alien invasion of Earth.

The game follows human history from the 1900s through 2020, with 10 movements per turn and each movement representing one year. Actions include sabotaging technology, sending hybrid agents, replacing specialists, and carrying out murder, mind control, abductions, and virus operations. Alien activity can reveal the invaders and give human nations time to prepare for an attack. Players gather energy from pyramids and rare volcanic minerals, develop the mothership through Science, Military, or Infrastructure choices, and build spaceships and probes. Fleets can be spread across Earth before the invasion phase, when ships rise from different locations for combat.

How Under Domain - Alien Invasion Simulator plays

01Covert Operations
Actions include sabotaging technology, using hybrid agents, and interfering with influential people.
02Mothership Development
Development choices fall into Science, Military, or Infrastructure paths.
03Fleet Preparation
Spaceships can be distributed around Earth ahead of the invasion combat phase.
04Resource Gathering
Pyramid energy and rare volcanic minerals are used to build war machines.

Under Domain - Alien Invasion Simulator compared to similar games

Xenonauts is also a turn-based strategy game about an alien invasion, but has players command a multinational human military organization, using persistent soldiers to fight extraterrestrials and recover technology. Under Domain instead puts players in charge of the invading aliens, with covert actions across human history and preparation of a fleet for the attack.

Under Domain - Alien Invasion Simulator: platforms & release

Is Under Domain - Alien Invasion Simulator worth it?

It is worth it if: strategy players who want to lead an alien invasion rather than defend Earth. Skip it if: players seeking immediate, continuous combat may find the covert planning and fleet preparation phases slow the pace.

Where can I download Under Domain - Alien Invasion Simulator?

Use the Download Now button on this page: it opens Under Domain - Alien Invasion Simulator's store page, where you can choose how to get it.

What platforms is Under Domain - Alien Invasion Simulator on?

Windows only.

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