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 1–10 of 464 games matching Base Building Β· updated 12 Oct 2026

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Not stated

Tower defense where the maze is yours to build and the ammunition is yours to manufacture. 16 towers, a factory of belts and assemblers fed by enemy debris, and a card every wave. Reach wave 50 β€” then find out that Hard was the easy one.

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ 1–4 players
Reviews
71% of 815

Permafrost is a story-driven survival sandbox set in a frozen, post-apocalyptic world. Discover a vast lore-rich open world, alone or in co-op with up to 4 players. Explore, scavenge, craft, and build a network of shelters to outlast the cold.

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Up to 8 players
Reviews
60% of 5

Turn a wild pixel-art world into a living factory. Gather by hand, automate five industrial tiers, explore for powerful optional upgrades, and master belts, pipes, power grids, rovers, trains and nuclear energyβ€”solo or in online co-op for up to 8 players.

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Free
Released
Price
Free
Players
πŸ‘₯ 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.

Free
Released
Price
Free
Players
πŸ‘₯ Up to 8 players
Reviews
60% of 5

Build a planetary empire, research game-changing tech, and raid real players across a persistent galaxy. The classic browser space strategy, reborn - and finally fair: no pay-to-win, ever. Team up for 8-fleet combined attacks. Your mines keep working while you sleep.

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
95% of 215

Decorate your dream frutiger home in this cozy co-op frutiger aero house decorating game. Pick a home layout, add from a wide range of frutiger-themed decor and hang out with your friends!

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
100% of 1

Mine the belts, colonize distant worlds, and choose your allies as three rival factions fight over a fractured frontier, then prestige through five starships and lead a joint fleet against the invading Dominion.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ 1–6 players
Reviews
40% of 5

A tower defense roguelite where every run deals you a different hand. Build towers, upgrade your hero with random card draws, and hold the line against waves of monsters. Play solo or in online co-op with friends.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated

Become the ultimate Brainrot collector! Explore an open-world map, hunt silly creatures from COMMON to OMNIPRESENT, fill up your Codex, build your gold empire... and face off against your friends in multiplayer. The ultimate brainrot simulator is here!

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ 1–8 players
Reviews
85% of 182

Explore, Build, Farm, Craft and Fight in this survival sandbox adventure for 1-8 players. Delve deep to uncover the secret of the invading 'Faults' and restore stability to the land.

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