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 31–40 of 60 games matching 4X · updated 12 Oct 2026

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
0% of 1

The Little World is a strategy-based tactical game featuring random campaigns, story maps, custom game maps, and custom character creation, with support for multiplayer battles and cooperation.

If you loved these, you'll love this

$$
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Price
$$ · Standard
Players
👥 Not stated
Reviews
85% of 638

In this Grand Strategy game, you take control of the Solar System's Great Powers in 2092 and weather the storm of change as you navigate the uncertain waters of the future. Control the greatest military forces in the world and wage wars on an epic scale: outer space is yours to conquer!

Free
Released
Price
Free
Players
👥 Not stated
Reviews
69% of 204

In a post-apocalyptic world submerged by the sea, the wake of the enemy is apparent at every turn. From turning the tides of naval warfare to dominating the skies in break-neck aerial combat, every decision you make will change the outcome of the battle.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
79% of 43

Square Wars is a rogue-lite square-conquering game featuring real-time strategy, resource gathering, survival, and card-based gameplay mechanics. 🌍 Randomly generated maps make each game unique. Join the adventure solo, in local co-op with a friend, or online! 🎮🔥

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Up to 6 players
Reviews
79% of 2,392

Lead armies, rebuild fallen kingdoms, and rise to greatness! Embark on an epic journey of strategy in a visually stunning world. Fight intense battles and uncover a captivating story.

If you loved these, you'll love this

Free
Released
Price
Free
Players
👥 Not stated
Reviews
62% of 8

《文明征程》是一款以历史文明为背景的策略游戏,让玩家扮演一位伟大的文明开拓者,带领自己的国家蓬勃发展。在游戏中,你将面临各种挑战和决策,需要智慧和策略来发展经济、建设城市、训练军队,同时也要与其他玩家进行外交交流和战争对抗。

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
70% of 44

Stardust Exile is an RTS set in the Milky Way galaxy, containing currently known stars and exoplanets with their real characteristics. The remaining star systems are procedurally generated. It has both online mode and single-player skirmish mode. The online server is persistent and single-shard.

$$$
Released
Price
$$$ · Expensive
Players
👥 Not stated
Reviews
82% of 1,884

From the developers of Warhammer 40,000: Gladius, ZEPHON is a post-apocalyptic 4X strategy game built on Proxy’s unique tactical combat system. Guide survivors through a turbulent future, navigating unexpected disasters, eldritch horror and cyberpunk monstrosities. What will you do to survive?

Free
Released
Price
Free
Players
👥 Not stated
Reviews
46% of 15

Command history's most iconic war vessels as you build your own massive naval fleet. Level up important tech modules and prepare to dominate the oceans!