The way to play is that you have to try to click(or touch via mobile) the moving ball. Notes: You can sometimes, but usually you can't ever click the ball while it's in motion. Even though it seems it would be easier to just have your mouse in one place and click, its definitely not. If you think it's to hard, you can peek in on the inside and change either the ball size or speed.
You can 100% and I ENCOURAGE YOU TOO remix the project and make it better. This is kinda a lame and easy to build project, but its (hopefully) entertaining. So, if someone good at coding came along and made it much better, that could be awesome. Secret, see if you can find the =) in the title!!!