Games like Portal Knights on Steam
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Tinkertown
Gather your friends and come to Tinkertown - A refreshing new Multiplayer Sandbox Experience! Explore magical places filled with loot, danger, and creativity.
RPG World - Action RPG Maker
RPG World – THE Action RPG Maker! Unleash your imagination with RPG World and create, share and play amazing 3D games with our growing community. Claim glory and treasure as you conquer magical worlds, alone or as a team. No coding required!
Scrapnaut
Scrapnaut is a co-op & singleplayer top-down, base building survival game with steampunk elements. Explore an open world with different biomes, take care of oxygen, manage your farms, generate electricity, build your home and much more!
Project 5: Sightseer
Open world multiplayer sandbox/RPG game. Explore, gather, build, research, and fight to protect what's yours -- by yourself or together with your friends.
Scrap Mechanic
Enter the creative paradise of Scrap Mechanic! Build fantastic machines, go on adventures with your friends and defend against waves of evil Farmbots in this imaginative multiplayer survival sandbox. With Scrap Mechanic’s powerful creation tools you can engineer your own adventures!
Keplerth
Welcome to Keplerth! Try to survive on a hostile alien planet in this 2D sandbox RPG, where you can choose to live alone or fight side by side with your friends in the online multiplayer mode. Survive, build, farm, fight, and explore your way to victory in this open-world adventure!
Wurm Unlimited
Wurm Unlimited is the standalone version of the fantasy sandbox world Wurm Online, the MMORPG where the players are in charge! A pioneer in the ideas of player influence, crafting and adventure, it is now one of the most deep and feature packed true sandbox experiences available.
Block Story™
There isn’t much better than a wide open game world in which you have essentially no limits and can alter the very landscape in which you play – that is, unless you add dragons, of course…
Grounded 2
Shrunk again, but the world is much larger. In this open-world, single-player or co-op survival adventure, craft weapons and armor, build your base, and traverse the playground on your buggy. But something else is out there—and it hasn’t forgotten you.
Planet Explorers
Planet Explorers is an open world sandbox adventure RPG game set on a distant planet. The game uses a new OpenCL calculated voxel system to allow players to change the terrain in any way, create new objects such as weapons, vehicles, objects, and do it anywhere.
DRAGON QUEST BUILDERS™ 2
DRAGON QUEST BUILDERS™ 2 is a block-building RPG set in a fantasy land threatened by an evil cult. Explore, battle, build and harvest in the charming single-player campaign or build big projects in the online sandbox mode for up to 4-players.
Disney Infinity 2.0: Gold Edition
Enjoy Disney Infinity with a Full Toy Box! Disney Infinity 2.0: Gold Edition invites you to enter the worlds of Disney Storytelling and Marvel Adventures with all Disney Infinity 2.0 Characters and Playsets Unlocked to enjoy experiences only Disney, Marvel, and your imagination can bring to life.
Drake Hollow
Build and defend villages of vegetable folk from deadly feral beasts in the blighted world of The Hollow. Explore, gather, and fight! You can even invite your friends. Can you craft the perfect village?
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.
Signs of Life
Signs of Life is a sci-fi survival sandbox platformer with a combination of procedurally generated and hand-crafted content. You'll explore mysterious locations, Mine blocks for resources, and meet strange (and some familiar) creatures, some of which don't even want to kill you and eat your corpse.
Solace Crafting
Embark on an adventure set in a fantasy survival RPG. Visit a borderless, open world where you manage resources to construct your base and new types of equipment to support your conquest.
Force of Nature
Force of Nature is a Sandbox game that combines Action, Adventure, RPG, Strategy and Management genres
Longvinter
Fish, farm, craft, gather, cook, loot or steal from other players and build a campsite or a village with your friends in an open-world multiplayer sandbox game without rules!
Feel The Snow
Choose one of the characters and start your journey. The game has many interesting things in store: building, crafting, puzzles, bosses, mystery, laughs, quests etc.
Creativerse
A sandbox adventure game as big as your imagination.
TerraTech
TerraTech is an open-world, sandbox adventure game, where you design and build your own creations through a mix of crafting, combat and discovery. Design vehicles from a huge library of blocks. Scavenge, craft and buy new parts to survive and become the ultimate planetary prospector.
Last Oasis
Nomadic Survival MMO. Build wooden walking machines to travel to new lands. Create clans and fight for territory. Resources deplete fast, so take your sword and scavenge, pirate, and trade to stay alive.
Road to Eden
Road to Eden is a third-person multiplayer survival coop game, set within the post-apocalyptic ruins of a world destroyed by an alien invasion. You wake up at the side of the road with no memory and must team up with other survivors to make the long and dangerous journey to Eden.
Junk Jack
Make the world truly yours in Junk Jack, a relaxing sandbox experience focused on building and improving your home. Discover new planets, tame and breed creatures, cook foods, collect animal companions, farm exotic plants, collect fish, grow flowers, play with your friends!
Raft
Raft™ throws you and your friends into an epic oceanic adventure! Alone or together, players battle to survive a perilous voyage across a vast sea! Gather debris, scavenge reefs and build your own floating home, but be wary of the man-eating sharks!
Necesse
Build, quest, and conquer across an infinite procedurally generated world. Play alone or with friends as you establish a settlement and explore deep dungeons, fight monsters and bosses, mine rare ores, craft magical equipment, recruit specialists for your colony, and more!
Nighthold: Number 1
Investigate a starship crash, explore a hostile world, build shelters and survive nightly attacks of the Rot. Tear down any structure and experience total freedom of action.