Hi everyone. Most codes work for a limited time and that's why you see codes posted that you try that do not work. They used to work but no longer do.
As I'm writing this on 11/21/2015 the following codes are still active for sure:
(All four of those give 4,000 coins each and nothing else)
And lastly like the last poster wrote:
(That one gives 2,000 coins and 30 tokens)
Any of them may stop working at any time though, so they're only guaranteed to be working at the time I'm making this post here. I've tried most of the other codes here and they have been inactive, though I'm sure there are more than this currently working from other sources.