Online co-op Action RTS games

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

Showing 91–100 of 110 games matching Action RTS · updated 12 Oct 2026

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
70% of 343

Experience the thrill of Hoverboard Basketball! Team up or challenge players worldwide in fast-paced crossplay PvP matches. Master the ball, dribble, and outwit your opponents to score impressive goals— with no aim assist. Only skill and creativity matter. Grab your Hoverboard and dominate now!

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
54% of 31

Do U Copy? is a VR co-op game ideal for parties, designed for friends, families, and couples. It challenges players with bank heists, where one is a VR Thief and the other a Hacker on PC/Mobile. Teamwork and strategy are key to success in this exciting heist adventure.

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Up to 3 players
Reviews
91% of 153

TimeMelters is a strategy hero-defense game where every run creates a new timeline. Play the full campaign solo or in two-player online co-op using our free Friends Pass — or put your skills to the test in a Challenge Mode with over 40 unique, time-twisted puzzles!

Free
Released
Price
Free
Players
👥 Up to 100 players
Reviews
95% of 41

This is an online game about the scene of the High School Affiliated to the Normal University. If you meet a classmate of the Middle School Affiliated to the Normal University in the scene, remember to say hello.

If you loved these, you'll love this

Free
Released
Price
Free
Players
👥 Up to 8 players
Reviews
95% of 43

Okashi Towers is a Real Time Strategy game with Tower Defense elements. Gather candy resources to build tower units or go on offense and summon creatures to attack other player bases. Join with up to 8 players and choose one of the four factions that fits your play style best

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
80% of 91

New Real Time Strategy Game based on medieval times, where you will control powerful factions and empires, with large-scale epic battles, asymmetric civilizations, unit customization system with RPG elements, dynamic AI, 8K support and much more.

Free
Released
Price
Free
Players
👥 Not stated
Reviews
38% of 576

"ASTRAL TALE"- Myth of the Stars," a classic Japanese MMORPG, is now officially operating worldwide. A brand-new profession has been introduced, allowing players to embark on a unique journey across the stars together!

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Up to 4 players
Reviews
82% of 1,604

The RTS/FPS phenomenon has moved into space! Build your base on an asteroid, command fleets of starships for epic battles, pilot fighters, mine and trade resources, assemble robots to defend or assault other stations. Take sole command or share the glory as you fight for control of the quadrant.

Free
Released
Price
Free
Players
👥 Not stated
Reviews
66% of 9

Open world, multiplayer online tower defense confrontation game. Fight with teammates to upgrade your heroes, build bases, produce your own troops, command troops to form formations, and defend or attack enemy positions. Come and build your online fortress together.