Become an influencer - earn or donate money
Use word of mouth to advertise your business
AdventureQuest Worlds
en.wikipedia.org  
Matthew Blocker (thegiant) - "The Web Flash MMO from the makers of AdventureQuest. Played this one a little bit early on before launch. Just getting back into it."

Videos

Aqworlds Tv Commercial -

Adventure Quest Worlds Ga