Online co-op RTS games

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

Showing 141–150 of 213 games matching RTS · updated 12 Oct 2026

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$$
Released
Price
$$ · 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.

Free
Released
Price
Free
Players
👥 Not stated
Reviews
83% of 24

Suho Defense is a top-view style defense game. Experience battles and cool characters, and win the game with strategic judgment and flashy battle play.

$$
Released
Price
$$ · Standard
Players
👥 Up to 2 players
Reviews
100% of 1

Ulia Chronicles is a city-building game set in a fantasy universe. Build your city, gather resources, and make your citizens thrive. Play alone or with your friends in this game inspired by the classics of the genre.

If you loved these, you'll love this

Free
Released
Price
Free
Players
👥 Up to 4 players
Reviews
90% of 20

BioFusion is a VR co-op multiplayer, PvE, first-person-shooter, tower defense game. Swing on a grappling hook, ride a hovercraft, throw grenades, collect buffs, build towers and traps. Do what you must to keep the mutants from the Spores of Evolution.

$
Released
Price
$ · Cheap
Players
👥 Up to 7 players
Reviews
57% of 7

Periculum is a casual strategy game about conquering hexagonal tiles. Choose from many different game modes and maps or create your own unique levels. Engage in epic battles against up to 7 bots or challenge your friends to see who comes out on top. With plenty of unique options to choose from.

$$
Released
Price
$$ · Standard
Players
👥 Up to 4 players
Reviews
86% of 708

Axon TD lets you expand the map boundaries themselves. A huge arsenal of towers and a wide variety of enemies clash in a battlefield that grows to your whims. Engage in single, cooperative, and roguelite gameplay.

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
72% of 418

Coming of age as a part of the first generation born free, WWII stripped me of my family, home, and future. Now I'm left with only one choice: to get my revenge and independence, or die trying. The odds are against us: will our tactics, stealth and teamwork be enough?

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