Games like Boundless on Steam
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Perpetuum
Perpetuum is a persistent, sandbox, single server, massively multiplayer sci-fi rpg (MMORPG). Control huge robots and mechs to gain access to an alien planet's resources and knowledge, amass huge wealth, or even claim part of the world for yourself using terraforming and complex infrastructure.
Stash
Stash is an MMO with turn based grid combat, custom housing, a tabletop art style, and more loot than you can fit in a portable hole. Stash has the charm of a pen-and-paper gaming group with the gameplay of a deep, interesting, unique RPG. Join our friendly community!
Subnautica
Descend into the depths of an alien underwater world filled with wonder and peril. Craft equipment, pilot submarines and out-smart wildlife to explore lush coral reefs, volcanoes, cave systems, and more - all while trying to survive.
Animallica
In Animallica you are racing against extinction after a deadly virus ravaged the world. As the lone survivor of the last conservation center on Earth, the fate of every single animal and plant species lies in your hands.
Plains of Pain
Survive a brutal open world alone or with friends. Explore a procedural wasteland scorched by chaos. Build and defend your base, trade for what you need, complete deadly quests, and fight to claim faction outposts before someone else does.