Help in GameMaker

So how important is it exactly that my game jam be two player capable? I had an excellent game concept in mind, but it kind of got bulldozed as soon as i read the 'must have local multiplayer capability' part.
Hello. I am trying to make a jump sound affect. I am new to coding. I have a sound, how do I make it play when I jump? I watched tutorials; do I have to enable sound on my game or something? I'm using Drag and Drop.

IDK why my code error i watch tutorial on https://www.youtube.com/watch?v=f9XnGCEuWOA
thare,

Hi everyone, does the game have to be under 5MB when exported for Windows too or only for HTML5? Right now my game is at 1MB on HTML5 but about 15MB on Windows and I'm not sure how to make it smaller. Everything I try reduces it only a negligible amount
hello i have a question, my game plays slowly on gamejolt but in my local html file it works fine i also saw other games have the same problem a solution?
[edit] it works fine in opera
@gamejolt is applying patches to Opera GX game jam entries allowed, or no?