Looking for Adnetworks - Gaming niche

Hey folks! I'm currently buying Display traffic from several sources, but I need more gaming sites traffic, or related content sites (for instance, I'm buying from a cartoon/hentai site that's doing good). So I was wondering if you happen to know some Adnetworks that could be a fit for this kind of traffic (adult or mainstream, doesn't matter). I can pay CPM / CPC.
Thanks!