Your link should look more like this:

https://dl.dropbox.com/u/46018476/example/index.html
 

(null link, just an example)

Go into your Dropbox "Public" folder, where your game should be, right click your index.html file, and choose "Dropbox >> Copy Public Link". Use that.

Your link should look more like this:

https://dl.dropbox.com/u/46018476/example/index.html
 

(null link, just an example)

Your link should look more like this: https://dl.dropbox.com/u/46018476/example/index.html

(null link, just an example)