I downloaded everything and took a look and they seem to work fine. I tested on Chrome, IE, Firefox, and Opera.
However, I had to disable the calls for the information it's loading from the web addresses because, there's no content and it causes an error in the bowsers and after closing the error message, the web page exhibits a 404 error. Even at that point the game pages load perfectly before the 404 error.
I strongly suspect it has something to with how the data is supposed to load from the external source, that's causing the problem. I would focus on that since you handle things differently in each game. Pretty sure that's where the issue is but with the addition of the CSS info and not being able to see the data load it's hard to make a true comparison. Clearly it works fine until the data loads from the external source.
Hope this helps.