Brickadia is described as '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!'. There are six games similar to Brickadia for a variety of platforms, including Windows, Mac, Steam, Xbox and Playstation. The best alternative is Minecraft. It's not free, so if you're looking for a free alternative, you could try Roblox or Muck. Other Brickadia like games are LEGO Worlds (Paid), Blockland (Paid) and Lego Universe (Paid).
Minecraft is a sandbox game that revolves around using building blocks to create anything you want. At night, monsters come out; make sure to build a shelter before that happens. The game also has multiplayer capabilities.
Roblox allows you to create games, build whatever you want with lego-like bricks, play other games made by users of the community, and even participate in the economy by trading, selling, buying, and collecting items.
Blockland is a non-linear sandbox game with no set goals, giving players the freedom to design and construct elaborate structures. Styled as a tiny minifigure, players build inside of the virtual world using bricks reminiscent of toy blocks.
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.
Muck is a survival-roguelike. Collect resources, find items &amp; build a base to survive for as long as you can.Collect resources, craft tools, weapons, & armor, find items & build your base during day.