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 11–20 of 464 games matching Base Building · updated 12 Oct 2026

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$$
Released
Price
$$ · Standard
Players
👥 Up to 6 players
Reviews
53% of 327

Build vehicles from the ground up and drive them across a hostile open world. Scavenge parts, tools and supplies, engineer your chassis, engine, wiring and controls by hand, and fight off wildlife, the undead and rival survivors. Play Survival solo or in 6-player co-op, or build freely in Sandbox.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
100% of 2

A co-op action game about protecting your mom in a post-apocalyptic world. Explore ruined cities, gather resources, upgrade your motorhome, build defenses, and battle enemies. Your mission: Get Mom to safety. Her survival is in your hands!

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$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
0% of 1

Guard your campfire through the night and feed your rivals' rifts with monsters. A multiplayer tower-defense survival hybrid where deck building, base building, and dueling economies decide who survives and who freezes.

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$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
83% of 96

33 Days till Extraction is a top-down sci-fi action RPG shooter with roguelike progression. Harness brutal firepower and necromantic skills to survive.

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$$
Released
Price
$$ · Standard
Players
👥 Up to 2 players
Reviews
79% of 63

Craft your special recipe juices and sell them in medieval villages. Expand your business with new recipes, machines, properties, and workers. Play online with your friend or go solo, and enjoy the growth of your business.

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$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
87% of 2,687

Start small, team up with friends, and automate production with conveyor belts, pipes, and magical devices. Stock your shop with potions, jewelry, and relics, complete commissions, and build an alchemy empire! Alchemy Factory 1.0 is out now with the Wagon Logistics System and revamped shopkeeping.

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
100% of 3

Mahjong solitaire meets a casual city builder story game in Ancient Rome. Build the city to restore it to glory. Solve tile-matching mahjong solitaire puzzles, unlock game-enhancing boosts, and tackle historical Roman city-building tasks for relaxing exploration and adventure in Emperor of Mahjong®.

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