Online co-op Base Building games

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

Showing 71–80 of 464 games matching Base Building · updated 12 Oct 2026

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Free
Released
Price
Free
Players
👥 Up to 4 players
Reviews
0% of 2

A free co-op automation game where you and up to 3 friends grow a living mycelial network across an alien planet. Consume local creatures, build biological production chains, and evolve from a tiny spore into a cosmic entity together.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
58% of 12

A dark wave-based zombie defense game where you build your defenses, fight relentless undead hordes, and survive against the infected… and hostile raiders?

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
81% of 85

Last Breath is a solo/cooperative terraforming survival game. Dig through terrain, build powerful machines, and restore life to a dead planet. Work together to survive, automate, and reshape the world from the ground up, literally.

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$
Released
Price
$ · Cheap
Players
👥 Up to 10 players
Reviews
60% of 5

A cozy cooperative village-building active clicker for solo players, families and friends. Gather resources, build your settlement, defend against raiders and prepare expeditions together — without stress, automation or idle mechanics.

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Free
Released
Price
Free
Players
👥 Up to 16 players
Reviews
84% of 19

A multiplayer top-down tank game for up to 16 players. Capture bases and pillboxes, harvest trees, build roads and walls, lay mines, and battle for control of the island. The Macintosh classic, rebuilt for modern platforms — free, open source, and cross-platform across desktop, mobile, and web.

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$
Released
Price
$ · Cheap
Players
👥 Not stated

This is a survival game where you must unveil the story and find your truth. Decide your fate and avoid trouble in the form of military bandits and keep an eye out for those pesky sharks! Explore dimensions, islands and discover civilisations. Good luck!

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Free
Released
Price
Free
Players
👥 Up to 4 players
Reviews
50% of 6

A Dungeon Builder and Crawler Roguelike where you can construct your own dungeon or raid one designed by your friends. Vie for victory, defeat minions, and evade traps as a party of up to 4 Challengers, or create the most diabolical dungeon imaginable as the Dungeon Boss!

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

Run an item shop in the Australian outback. Stock swords, potions, and emu eggs. Delve 15 dungeons for loot. Your customers work jobs and spend their wages on your wares... if you can keep them supplied.

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$$
Released
Price
$$ · Standard
Players
👥 Up to 20 players

Idle survivor meets shared world. Your Hold produces resources 24/7. Your expeditions push back a fracturing reality. 25 regions. 8,000 zones. One world. Every player matters. Success and failure is shared by your entire region.

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