For Kongregate, it's organic search (people searching for specific games) plus referrals (gaming blogs etc linking to games) plus in-game sponsorships (we pay g

For Kongregate, it's organic search (people searching for specific games) plus referrals (gaming blogs etc linking to games) plus in-game sponsorships (we pay game developers on a CPC basis to include our logo and link inside their games on other sites). Every other game site does that too, our advantage is stickiness (people stay for achievements etc) and good SEO/pagerank. Probably a lot of word of mouth, too. We could see this in our early days we would notice that a particular town would light up on analytics. In many cases most of the traffic was coming from a particular high school or something.