I want to direct you to series of posts by Ben Whitehouse in his blog Improvoker (which is a great name). He's going through a UCB (Upright Citizen Brigade) class in New York: Improv 201. At this point, there are only two entries, but the class is focusing on long form work and "finding the game". His first entry was from the 4th class in the session when he had an interesting insight into the concept of "finding" the game. Rather than it meaning he had to search out a game from the scene - artificially building a game from elements in the scene - he realized that it also meant discovering a game by chance or happenstance.
Along with that realization he thought about the concept of finding "a" game rather than "the" game. This seemed to eliminate some resistance he was having to these "cerebral" concepts in long form work. His post is well written and insightful.
His second entry focused on the second beat of a Harold scene. This second beat is the second round of scenes that follow the first set of establishing scenes. It should carry forward the games found in the the first beat, not necessarily the plots. He gives a good example of this and the post is worth a read for some more insights he has into the Harold long form.