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 21–30 of 464 games matching Base Building · updated 12 Oct 2026

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Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
69% of 43

Sigma World Online - is an online sandbox with a huge world from many star systems. Choose who to be: space explorer, miner, merchant, farmer, culinary specialist, scientist, builder or hunter, or build your empire.

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$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
65% of 23

A few logs, one harpoon, no land in sight. Pull driftwood from the sea and build your raft into a floating town, on your own or with friends you invite straight from Steam. Dive to the ocean floor. Raiders come at night, sharks circle, and somewhere out there, a leviathan is waiting.

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$$
Released
Price
$$ · Standard
Players
👥 1–4 players
Reviews
82% of 62

Gather, craft, build and explore alone or with up to 3 friends. Unlock new land, collect resources, build and decorate your home, farm, fish, automate production, upgrade your character, and defend against optional enemy raids.

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$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
100% of 1

Fantasy Waifu Collector is an exciting game about collecting "Waifu" in order to build an army to build a town and restore the world from decay! Players will recruit many different characters as they explore a fascinating world filled with monsters. Defeat the Demon King to win, right?

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$
Released
Price
$ · Cheap
Players
👥 Not stated

Avatar Quest Online is a sandbox MMO where avatar life, crafting, casual FPS combat and NPC life run at once. Build with unlimited blocks, decorate with nearly 100 furniture pieces, level up battling dinosaurs and dragons, and chat by voice and text. Updated daily in Early Access.

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$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
100% of 1

Catnip Wars is a 1–4 player co-op tower defense. Play as scrappy Catbots defending your catnip farm from monster waves — build and power turrets, raise walls, harvest resources, man the BFG, revive fallen friends, and climb the tech tree. Play solo or online with friends. Achievements/Leaderboard

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Released
Price
$$ · Standard
Players
👥 1–8 players
Reviews
75% of 204

Competitive mall simulation. 1-8 players open stores in the same mall, fight for customers, crush rivals. Team up or go solo. Fair play or dirty tricks? Your call. Procedural maps, employee system,mall cops, smugglers and physical mechanics.

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$$
Released
Price
$$ · Standard
Players
👥 Up to 4 players
Reviews
68% of 449

You're the last remaining video rental store. From humble VHS clerk to rental racketeer - run your video store and explore Reshoot Springs, building an underground empire. Expand with upgrades, side hustles, store membership, and more. Whatever it takes to survive - solo or in up to 4-player co-op.

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
40% of 10

Start with a brick and build a life in a Newark-inspired urban survival sandbox. Scavenge the city and forest, unlock blueprints, build and raid bases, drive stolen cars, command recruits, outsmart rival clans and police, or survive with friends in co-op.

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