Hey,
It's my first shot at web development.
I downloading the source code for a game. It has the following subfolders : images, js(having a file called source.js which pretty much looks like the source code for the game), index.html and css.

How do I view the output ?
Do I have to build and run the code ?

Thanks

PS : Sorry to ask a very elementary question, but it's my first day at web dev.