Muck is described as 'Trapped in the muck on an island, alone or with your friends, try to survive as long as possible by using the resources you find around the island' and is a Sandbox Game in the games category. There are more than 50 games similar to Muck for a variety of platforms, including Windows, Mac, Android, Linux and Steam apps. The best Muck alternative is Minecraft. It's not free, so if you're looking for a free alternative, you could try Luanti (formerly Minetest) or Veloren. Other Muck like games are VoxeLibre (formerly MineClone2), Terasology, LEGO Worlds and Vintage Story.
Unturned is a sandbox game in the emerging multiplayer apocalypse survival genre. Rather than focusing on being an MMO it provides players with easy systems to sit down and survive the zombie infestation with their friends.
Canada
Blockland is an online multiplayer game where you build things with bricks. It's like playing with legos on the internet.
United States
Indie sandbox game with mining, crafting and exploration elements, mainly inspired by Minecraft, Terraria and Junk Jack. It has a side-view camera, mixing 2D with 3D, polished pixel graphics with lot of personality, and great sound effects!
Cube World is a voxel-based action RPG with a focus on exploration. It takes place in a procedurally generated fantasy world made up entirely of cubes.
Germany
EU
Mini World is a 3D free-to-play sandbox game about adventure, exploration, and creating your dream worlds. There is no grinding or leveling up. No IAP gate that locks features from free to play players. Everyone can enjoy the game’s full features with great freedom
A multiplayer brick building game that gives you the tools to create and play, your way. Build and invent with your friends, or blow them to smithereens!
Creativerse: The Definitive Edition is a sandbox adventure game set in a beautiful yet treacherous world shrouded in mystery. Adventure solo or bring your friends, unearth secrets, and tame the land together!
United States
Stranded is a 3D survival game. You are playing the role of a castaway and your goal is to "simply" survive on the purportedly lonely island at whose sandy beach you have been washed up by the sweep of fate.
GermanyEU
The Fun-Focused Free Software Voxel World Game. Voxelands is a sandbox construction game based on Minetest.
Sky Nations is a multiplayer sandbox game where players can join together to build air ships(cannons and all!) and do battle across a vast world procedural world full of relics and machines from an ancient world waiting to be plundered by daring sky captains and their motley...
Mythruna is a game under construction combining extensive world building, crafting, and sandbox elements with just a touch of role-playing. When completed, Mythruna will be a unique gaming experience.
