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 91–100 of 213 games matching RTS · updated 12 Oct 2026

Filters: RTS × Clear all
$$
Released
Price
$$ · Standard
Players
👥 Up to 8 players
Reviews
87% of 1,166

The Scouring is an RTS with fast pace, high attention to detail and next generation experience. Lead humans or orcs in a Classic Mode or use one of powerful Heroes to fight for victory! Play alone or with friends. Use our modding tools to create maps and custom game modes! Join The Scouring!

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
97% of 39

Cats Go! is a defense game blending strategy, cooperation, and direct combat. Grow mutant plants to protect your village! Whether you prefer to play solo as a brave defender or team up with friends online. Not feeling cooperative? Slip into the role of a devil cat and secretly sabotage the village!

Free
Released
Price
Free
Players
👥 Not stated
Reviews
56% of 23

Prepare for a thrilling adventure where every decision counts. Construct your base, gather resources, and train unique troops to outsmart your opponents in tactical combat. Raid enemy villages for loot, forge alliances with other players, and expand your territory in a quest for ultimate dominance.

Free
Released
Price
Free
Players
👥 Up to 3 players
Reviews
46% of 9,274

Stormgate is a free-to-play real-time strategy game with a full single-player campaign, 3-player co-op, and PvP versus modes on over 60 maps. Our Editor is also freely available for you to craft just about any custom game mode you can imagine. Join our development journey today!

$
Released
Price
$ · Cheap
Players
👥 Not stated

Steal It is an online multiplayer game 🎮 where it depends on who has the most coins 🪙 at the end of a round. Coins can either be obtained as rewards by completing tasks ✅ or by stealing them from other players 🕵️‍♂️.

$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
85% of 60

This is a minimalist-style tower defense game that is easy-going and relaxing, with a moderate level of difficulty. Build your tower formations to fend off enemies. It also supports online multiplayer, allowing you to team up and experience an unprecedented level of tower defense fun!

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Up to 2 players
Reviews
92% of 10,737

Gird your loins and sharpen your steel! Besiege 20 unique enemy lords and battle friends online, in this expanded remaster of the classic 'castle sim'. Relive history with new units, opponents, visuals, audio, campaigns, skirmish trails, co-op and larger maps.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 5 players
Reviews
53% of 13

Dr. Voss' Escape Room is a relaxing multiplayer puzzle game for up to 4 friends. Explore a mysterious lab, solve challenging puzzles, and uncover secrets to create the immortality potion. Perfect for those who love teamwork, creativity, and a chill escape room experience!

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
75% of 37

A resource management and collaboration game where you gather, build, and progress through a unique constellation-based upgrade system. Accessible, relaxing, and endless—perfect for playing with family or friends.