If you would like to make a building game similar to Roblox's "Welcome to ROBLOX Building" you will have to build a preselected area for people to build and script the areas so that once you claim an area it temporarily becomes yours. OR (And I'd recommend this) You could create a new place from your pages menu, or take an old one, and once configuring it, set it from a regular place to a "Personal Server". Now you can set the permissions based off who can do what in it and who has access. Then join the place for the first time to configure it to the type of landscape you want.
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There are several online games similar to Roblox. Roblox's main competitor is Blockland, which is almost the same thing as Roblox with a few changes. Another game, Minecraft, is similar to Roblox in that it is a building game, but other than that it is very different.
While there is no other free game like Roblox, there are other games that involve building and a block world. One of these games is Blockland, which is like Roblox but costs $20 to play. There is also a game called Minecraft which costs $15-$20 and is like a Roblox except it is a build-to-survive only game.
Use one of Anaminus's Script building games.
you can go to make my game
Building skills, scripting skills