You need Scratcher status to be able to use this project. Run it in Turbo Mode. (Shift-Click the green flag before playing.) Most likely, no one will be online. My Cloud List: https://scratch.mit.edu/projects/41197522/
This project is shared only for testing purposes. It is not complete, so it may be whitelisted. So far, multiple cursors are able to move together in two rooms. Next I'll probably work on fixing multiplayer instability, and add more features.