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, Yahaha and Novetus.
Growtopia is a multiplayer sandbox platformer with crafting. There are an infinite number of worlds where you can create with friends. Everything in the world can be grown from trees. Discover new items by mixing the seeds of trees you already have.
S&box is a platform and game development toolkit developed by Facepunch studio powered by Source 2. Initially, the development was based on Unreal Engine 4, but as soon as Half-Life: Alyx came out, Facepunch immediately requested the engine branch of the newly-published game.
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
Voxel Turf is a free-roaming voxel-based city building (and destroying) game, inspired by Minecraft, Simcity and the Grand Theft Auto series. The objective of this game for the player is to do whatever, and I mean whatever, they want.
It looks like the roblox maps.
Most users think Voxel Turf is a great Roblox alternative.
Infiniminer is a multiplayer block mining game with several different player classes to choose from.
Not all games in roblox relate to the game "Infiniminer".
A game builder offering unique creative tools that are fun and easy to use. You can create games without having to learn texturing, modeling or mapping.
Minecraft Earth is a discontinued Pokémon GO-esque Minecraft game. Roblox is a sandbox game platform with user-generated content.
despite the voxel engine, it provides the player with a variety of user-generated games, with no singleplayer survival mode.
Blockman Go Blocky Mods is the most popular Android Tablet alternative to Roblox.
Brick Hill is the ultimate building block game, allowing you to push the limits of digital bricks and make your own games.
Brick hill is probably one of the longest standing and most successful Roblox clones They are currently developing a new game client and so far it looks pretty good
Brick Hill is one of the pioneers of the alt-ROBLOX community. It has a tight-knit community, some great games, and there is a new client in the works that will improve the quality of the platform tremendously. As of right now, it's the best alternative to ROBLOX.
Lego Universe was a massively multiplayer online game and was available from October 2010 to February 2012. Players from around the world build and fight against the Maelstrom and its minions. The player travelled to various themed worlds.
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...
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.
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Because just looking at the screenshots it looks almost exactly like roblox, and the terrain and the block system and the way the city looks looks like roblox.