378 Action · Sandbox games your group can play together online, including CastleMiner Z, Viscera Cleanup Detail: Santa's Rampage, and Saints Row IV: Re-Elected.
All games: 24
CastleMiner Z is an infinite world filled with deep places to explore, and horrifying monsters to slay. Build structures out of blocks, craft weapons and tools from raw materials, and explore the vast and frightening world around you.
Tragedy! Santa; the toy giving folk-hero, and purveyor of fine Christmas goods, has had enough. Endless requests from greedy children wanting more and more every year, tax increases, pressure from elf unions, bills, reindeer!
Experience the insane antics of Saints Row IV. The Saints have gone from the Penthouse to the White House - but Earth has been invaded and it’s up to you to save it with an arsenal of superpowers and strange weapons, in the wildest open world game ever.
Build ships, stations, and factions with friends in StarMade’s online voxel sandbox. Create your own goals across a generated universe, with server-based co-op and PvP.
Feel the excitement of flying the Su-25T "Frogfoot" attack jet and the TF-51D "Mustang" in the free-to-play Digital Combat Simulator World!
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.
Take on short cooperative Challenges or build beside your friends in team battles, where King Arthur’s Gold makes fortress walls as fragile as your plans.
The original Euro Truck Simulator - the game which has become the classic of the genre and is still relevant today. The first truck simulation game in a European setting, with European long haul trucks!
Mine, build, and take on a changing world with your friends in Terraria. A desktop server starts with 16 online player slots; explore for better gear, then bring it into boss fights and invasions together.
Choose between different factions, with their own set of expendable soldiers, mechas, and weapons. Protect your brain, mine gold, and destroy the enemy cortex in his bunker complex!
The genre-defining military sim that began as Operation Flashpoint (2001), now a modernized, 64-bit, cross-platform build for Windows and Linux, with its engine released as open source. Over 2 million copies sold. The Cold War battlefield of Everon and Nogova, remastered for today's hardware.
Take one of eight heroes into Demigod’s team arenas, play custom matches with friends against bots, or compete for control of the battlefield.
Up to three players share one city map in Atom Zombie Smasher, directing a helicopter and mercenary units through short, unpredictable zombie rescues.
Three years after the conflict in Chernarus, portrayed in the original Arma 2, a new flashpoint explodes in the Green Sea Region. Coalition forces led by the US Army are deployed to Takistan to quickly restore peace and prevent further civilian casualties.
... 300 years after Aziraal has been banished, a brother and sister are drawn into the conflict which has flared up between the Orcs and the free world. Kyra, the hero's younger sister, suddenly disappears in mysterious circumstances.«...If my family really belongs to the chosen ones, why then have we always been as poor as church mice?
Crash Time 2 is an open-world arcade racing game where you play as an Autobahn police officer, engaging in high-speed chases, escort missions, and criminal investigations across a large free-roaming map.
Garry's Mod has no built-in co-op campaign, but its online Sandbox gives you and your friends physics tools, props, and a huge community workshop to turn an empty map into your own project.
The world is a vast, beautiful and dangerous place – especially when you have been shrunk to the size of an ant. Can you thrive alongside the hordes of giant insects, fighting to survive the perils of the backyard?
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.
The world of Elysia needs YOU! Join this cooperative, 3D sandbox action RPG to level up your character, craft epic weapons, conquer enemies in real-time, and build almost anything! Craft your adventure. Forge your hero. Become the ultimate Portal Knight!
Next Day is a multi-player SURVIVAL game with elements of RPG, in an imaginary country in Eastern Europe. Carry out an array of tasks, learn skills, and develop your character. Have shootouts with opponents and earn a reputation.
Colony Survival is a unique first-person strategy game developed by a two-man team. Build your own colony in a voxel world. Command guards, farmers, miners and other colonists. Defend your colony against the horde of monsters that attacks every night!
Of Guards and Thieves is a multiplayer stealth game in which high-powered guards face off against fast and elusive thieves in a contest of wits. Outsmarting the enemy and shooting your way through to the goal are equally valid strategies. Simple rules, emergent gameplay and high replayability.
Polarity takes it to the next level, demanding all of your wits and reflexes. Full-featured local co-op campaign.