Online co-op War games

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

Showing 11–20 of 261 games matching War · updated 12 Oct 2026

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Free
Released
Price
Free
Players
👥 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.

$
Released
Price
$ · Cheap
Players
👥 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.

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RIP

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
42% of 14

RIP is an all-out war simulation on the ground, in the air or at sea. With 4 different Soldier classes and their specific weapons in many different scenario maps from the middle eastern desert to a well-isolated bunker construction, you can fight as your heart desires and let the enemy bleed out in the dust.

$$
Released
Price
$$ · Standard
Players
👥 Not stated

A SciFi MMORPG: WoW in space, inspired by the classic Subspace. Join one of four warring factions, pick from six classes and 16 ships, and level to 100 through story quests, world bosses, battlegrounds and fast dogfights. Squad up, trade on your faction's Auction House and fight for the galaxy.

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

Heroes of Might and Magic‑style exploration combined with Three‑Kingdoms siege gameplay. Legendary Chinese heroes gather across time. Supports single‑player challenges, free‑for‑all multiplayer and team‑based combat. No tedious governance, fast‑paced and visceral battles.

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$
Released
Price
$ · Cheap
Players
👥 2–4 players
Reviews
66% of 3

An incremental swarm tower defense. Play solo or 2–4 player Steam co-op. Defend a doomed mining colony through a full campaign, infinite procedural maps and Workshop creations. Build towers. Call orbital strikes. Kill billions. The only good bug is a dead bug. Do your part!

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
86% of 102

“觀滄海,望神州,彈指寰宇定九州” 《三國觀滄海》是一款以三國亂世為舞臺的國風水墨策略戰棋RPG。你將置身章回劇本之中,親曆英雄興亡;亦將在格子戰場上調兵遣將,以走位、地形與兵種博弈奪取勝勢。在首個推出的劇本《魏武揮鞭》中,你將以曹操爲第一視角,走過諸侯會盟、挾天子以令諸侯、官渡爭鋒等關鍵節點——用謀略與決斷,寫下屬于你的亂世篇章。

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$$
Released
Price
$$ · Standard
Players
👥 Not stated

Bulwark Tower Defense is a competitive team tower-defense: wall your lane with auto-fighting units to hold back the waves, then spend essence to send monsters that break your rivals' defenses. Grow your economy, upgrade a shared King, and outlast the enemy team across 1v1–4v4.

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