This doesn't work, but you can try Multiplayer Test 2, which hopefully works: https://scratch.mit.edu/projects/871785781 This is only a test, but I hope it works. If it works or not or has a bug, you can tell me in the comments. To go forward, press the up arrow key or w. To turn, press the right or left arrow keys or a or d. To go backwards, press the down arrow key or s. This project can only have two player maximum (sadly). I'll probably make it more once this works consistently.
All the code is by me except for the part where something happens when you press the stop button. The code that does something when you press the stop button was by @sharkyshar, but it doesn't work for my multiplayer code. I changed it to @Saidcanada's version. History July 2 - shared July 2 - fixed some bugs July 3 - fixed some more bugs