Roblox is described as 'Online platform for 3D world building, avatar customization, multiplayer play, and user-generated game development with trading, achievements, and a virtual economy' and is a popular Sandbox Game in the games category. There are more than 50 games similar to Roblox for a variety of platforms, including Windows, Mac, Android, Linux and Web-based apps. The best Roblox alternative is Garry's Mod. It's not free, so if you're looking for a free alternative, you could try KoGaMa or VoxeLibre (formerly MineClone2). Other Roblox like games are LEGO Worlds, Core Games, Terasology and Polytoria.
Use guns, tanks, and even shovels to kill your enemy in different game-modes. Use your bricks to build shelters, walls, and stairways, or you can use your shovel or other tool to dig your way into enemy territory.
Welcome to Bloxd.io – a multiplayer sandbox game where creativity meets action. Whether you're building, exploring, or battling.
Modbox is a multiplayer game creation sandbox that lets players create games together online. It has it's own custom powerful visual scripting language to make multiplayer game creation easy. Released as VR only in 2016 - relaunched as Modbox 2.
BlockWorld is an addictive independent action sandbox game similar to Minecraft with full destruct-able environment, monsters and challenging quests.
Struckd is the next-generation gaming platform for user created content where people of all ages come together to create, share and play games. Create your own games and play thousands of others. Download for Mobile & Desktop: www.struckd.com.
Blockscape is the next generation voxel sandbox game. You play in a computer generated world made out of blocks.
Download and Play Best FREE 3D sandbox blocks craft game with Creative Multiplayer and Survival Modes! Build creative 3D world online, get resources, craft items in survival, tame animals, watch out mobs and survive! Explore worlds created by others.
MAGE stands for MAKE A GAME EXPERIENCE
The goal for MAGE is to make it as easy as possible for people to create their own 3D universes, adventures and stories. PLAY WHILE YOU CREATE!.
Golems Universal Constructor or Golems is a 3D recreational physics simulator.
Build robots, spaceships, clocks, catapults or cannons.
Add sensors, timers, switches, motors. Give it a brain. Make a mouse trap - or make a mouse.
Take the wheel and pilot your machine yourself.
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Buildbox is a breakthrough game creation experience. Creating games is as easy as dropping images into the software, making changes to their properties and hitting play.
Sploder is an online game creator. Create fun games that you can publish to the net and email to friends.
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It isnt 100% similar but he uses the same controlls of construction on roblox!