Games like Boundless on Steam
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Just Cause 2
Dive into an adrenaline-fuelled free-roaming adventure with 400 square miles of rugged terrain and hundreds of weapons and vehicles.
Blockland
Blockland is a non-linear sandbox game with no set goals, giving players the freedom to design and construct elaborate structures. Styled as a tiny minifigure, players build inside of the virtual world using bricks reminiscent of toy blocks.
Age of Water
Age of Water is an online adventure game set on a post-apocalyptic Earth completely covered in water. Sail through storms, fight and trade, capture other people's boats or build your own, extract resources from the bottom of the ocean and reveal the secrets of the Age of Water world.
The Elder Scrolls® Online
Every legend starts somewhere and in The Elder Scrolls Online, it starts with you. Join millions of players in an online, fantasy RPG set in a vast living Elder Scrolls world.
Survive the Fall
Explore, loot and fight in an open world action game set in a post-apocalyptic future after a devastating meteor strike. Assemble your team and take the fight to the enemy or choose a stealthy approach to gain the upper hand. Expand your base to research new gear and get ready to survive the fall.
Garden Paws
You have inherited your grandparents farm as they set off to travel the world. Work with Frank at the local construction shop to finish off the final touches on your new home. Aid Frank and Mayor Wilson in building up the town so it may reach it's full potential.
My Time at Portia
Start a new life in the enchanting town of Portia! Restore your Pa's neglected workshop to its former glory by fulfilling commissions, growing crops, raising animals, and befriending the quirky inhabitants of this charming post-apocalyptic land!
ICARUS
ICARUS is a PvE survival game for up to eight players. Explore a savage wilderness in the aftermath of terraforming gone wrong. Survive the Open World, complete timed Missions or build your Outpost. Explore, build, craft and hunt while seeking your fortune and prospecting for exotic matter.
Craft Hero
Gather resources by day, build and recruit by noon, defend your village by night! A new minimalism sandbox survival with countless new ideas – Craft Hero
Medieval Dynasty
Hunt, survive, build and lead in the harsh Middle Ages: Create your own Medieval Dynasty and ensure its long-lasting prosperity or die trying! Play alone or team up with friends to enjoy the ultimate medieval experience.
American Fugitive
FREE UPDATE; STATE OF EMERGENCY, OUT NOW! Framed for your father’s murder, you’ll need to do whatever it takes to unveil the real culprit. Tackle thrilling missions for the criminal underworld - just don’t let the cops track you down!
BEACHED
A free-to-play, low-poly, open-world survival shooter where you’ll battle other players, explore massive monuments, and fight to stay alive. Build and fortify your base to defend against enemy raids, gather resources, and conquer a harsh, competitive world. Survival means doing whatever it takes.
The Scroll Of Taiwu
"The Scroll of Taiwu" is an indie game themed around Chinese mythology and wuxia. Players assume the role of the mysterious "heir of the Taiwu clan" in an alternate ancient China, working through generations of heirs to defeat a powerful hereditary enemy and shape the fate of the human world.
Tinkertown
Gather your friends and come to Tinkertown - A refreshing new Multiplayer Sandbox Experience! Explore magical places filled with loot, danger, and creativity.
Mortal Online 2
A persistent sandbox world. No classes or levels. Train the skills you want for your own unique build. Player-driven trade, economy, and housing. Millions of crafting combinations. First-person immersive combat. Exploration. Bosses. Full loot, full PvP. The world of Nave is yours - who will you be?
Survivalist
It's one year after the collapse of civilization and self-centered hedge fund manager Joe Wheeler emerges from his specially constructed bunker in search of food. This is a huge open-world RPG where you have the freedom to play how you want - but your choices have consequences.
Winter Survival
Dive into the ultimate winter survival experience and see if you can survive long enough for rescue to arrive. Experience our unique sanity system that takes survival to the next level.
Fargone
Fargone is an RPG-based survival game with a strong focus on creating a living, breathing world through dynamic events, and NPC interactions. Set in a fictional land known only as The Barrens, you must survive by any means, whether that be alone or by allying yourself with a faction.
Pax Dei
Welcome to a vast, social sandbox MMO inspired by the legends of the medieval era. Here, myths are real, ghosts exist, and magic is unquestioned. Join thousands of players as you explore the land, build your home, forge your reputation, and craft your own stories. What world will you make?
Wayward Terran Frontier: Zero Falls
2d space combat like no other. From the perspective of a single crew member, explore the fully destructible interior of any ship in a massive living world. Engage in space combat with no hitpoints where you know your enemy is dead when you see them fall out of their ship into the cold dark of space.
Screeps: World
Screeps: World is an open source MMO RTS sandbox game for programming enthusiasts, wherein the core mechanic is programming your units AI. You control your colony by writing JavaScript which operates 24/7 in the single persistent open world filled by other players on par with you.
Tracks - The Train Set Game
Jump into the ultimate toy sandbox and build the train set of your dreams! Create colourful railway systems, decorate beautiful towns, transport commuting passengers, and even ride your train in first-person.
Summoners War: Chronicles
The King of Rahil is looking for a Summoner to protect the kingdom against Tefo's enormous conspiracy. Explore a vast world with your Monsters by your side in this new Action RPG set in the Summoners War Universe.
Just Cause™ 3: Multiplayer Mod
Just Cause 3 Multiplayer mod is a free fan-created project bringing an explosive and highly-customizable multiplayer.