Javascript does not work well at the User end? [closed]

I made a game chess but when I test it on my end using admin login but when I play this game on another device it’s working very bad. I create it using Javascript, html and css. I use wp coder plugin for it. Anyone who help me about this. I will show code and the link of site.

As I describe first, everything is fine at the admin end but on the user end it is too bad.