Additionally, the js code from google is minified / compressed. If you want to see the code cleanly, it will need to be pretty printed / beautified.

I was able to clean up the code using http://jsbeautifier.org/ Note that using jsbeautifier actually breaks the code in several places, so if you do that, it will need to be repaired manually. ( there is a line of css that is created dynamically, that jsbeautifier does not handle correctly )

The advantage to cleaning the code up that way is that you could then alter the code as desired more easily. ( such as adding 4 players.... changing the field layout.... or creating cheat keys )

The directions need to be followed exactly or there will be problems in the code. If you have problems, you should use firefox, and install the FireBug extension. Once you do so, you can activate firebug and it will report javascript errors. Once the error is known, whatever problem you are having can be pointed out.

There is a zip download of the files changed by other people floating around, but I would not recommend it because google will likely go after those people; the code itself is copyrighted and should not be posted anywhere.

Some people also put it up on github; but they are still using a very messy index.htm at the moment, rather than the stripped down code I showed above.