Online co-op 4X games

Every online co-op 4X game on Steam we know of, newest first. Add tags or a price band to narrow it down.

Showing 1–10 of 60 games matching 4X Β· updated 12 Oct 2026

Filters: 4X Γ— Clear all
Free
Released
Price
Free
Players
πŸ‘₯ Not stated
Reviews
40% of 50

A persistent, planet-scale real-time strategy MMO on one shared Earth. Forge alliances or betray them, hold your supply lines, and live with every mile of ground you take or lose. Real-time fronts that never pause. No rounds, no resets.

Free
Released
Price
Free
Players
πŸ‘₯ Up to 8 players
Reviews
60% of 5

Build a planetary empire, research game-changing tech, and raid real players across a persistent galaxy. The classic browser space strategy, reborn - and finally fair: no pay-to-win, ever. Team up for 8-fleet combined attacks. Your mines keep working while you sleep.

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
0% of 1

Iron Stars is a realistic space 4X strategy game where you explore believable star systems, colonize planets and moons, grow your population, and turn entire solar systems into industrial empires.

If you loved these, you'll love this

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
86% of 974

A massively multiplayer real-time strategy game pitting hundreds of players against one another. Over one million nuke each other every month.

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Up to 4 players
Reviews
100% of 1

A deep 2D strategy of cosmic trade and faction warfare. Build trading empires, refine asteroids, lead fleets into battle and run faction politics β€” solo or in four-player co-op

$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ 2–4 players
Reviews
92% of 79

A faithful digital adaptation of the acclaimed board game Space Empires 4X by GMT Games, beloved by wargamers for almost two decades. Command the rise of your civilization and the fall of others, all in one to two hours.

If you loved these, you'll love this

Free
Released
Price
Free
Players
πŸ‘₯ Not stated
Reviews
33% of 6

Build your kingdom, train armies, forge alliances, and fight for the throne in Solderia: Fall of Kings, a medieval strategy game where every decision shapes your rise to power.

$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Up to 32 players
Reviews
68% of 35

A fantasy strategy with turn-based tactical combat where your goal is to become a God. Build your empire, forge alliances, ascend to godhood, then watch every ally turn on you the moment you're about to win.

$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Up to 8 players
Reviews
75% of 96

Lead any of 221 countries through a living 2026 world in this data-driven grand strategy game. Shape economies, politics and alliances, wage conventional or nuclear war, run covert operations, and rewrite the global orderβ€”alone or online with up to seven friends.