We discussed some of the iframe issues mentioned above, including Matt Cutts' comments about iframe enclosed links, in this thread back in March, 2011....
Iframe Links: Do They Pass Page Rank?
Traditionally, it should be noted, iframes have very often been used to prevent the flow of PageRank from links visible to users... so, from the traditional point of view, a game embedded in an iframe isn't likely to be a good source of link juice.
It's hard to rule out, though, other tracking and weighting mechanisms... but I'm having a hard time imagining what they are. This isn't, e.g., "traffic" in the traditional sense.