There are no player limits for McWorld as it is not a map or a multiplayer game, but is rather a program plugin for "Minecraft." The program allows a server administrator or a user granted with permissions to control the functions of multiple "Minecraft" worlds individually.
As of 2015, McWorld has a version release history of up to version 1.31. As of version 1.3, McWorld allows its users to load multiple words once a server has been started. The plugin was first developed on Apr. 12, 2013, and is hosted on GitHub for interested users to download. The plugin was developed under the third version of the GNU General Public License.