[Tezcatlipoca]

Directly, you could be right. For a game like this it might not be useful advertising, but probably still advertising (then again, is anything that contains access information not advertising?). For other games or products it might be more useful. But one way it does help is in an indirect way. As someone mentioned Wikipedia is heavily traversed by google bots. If you can get your link in wikipedia, the more links the better, and the more associated with common related search terms, the better your SEO rating on google searches. Which will increase clickthroughs to your site by ranking you higher in google lists.