Welcome to Sketchbook, Your World! This isn't exactly a game per se, but is more like an environment builder and chat client. You get to build maps to either model something in the real world or to create your own environment, or maybe to serve as a sort of minigame for others to complete.
To start off with, this game is played online. That means, if you don't have an internet connection, you cannot join in.
Anyone can build maps and publish them in the unofficial menu, but they must be approved by an admin to show up in any other menus.
If you want a list of the possible chat commands, type /help.
Download link: https://SBYW.games/index.php