This is really two different tropes
1) Complementary games that are largely identical, except for a small amount of exclusive content.
2) Games that fit together into one game, but are split into parts sequentially.
The "other media" section is pretty much entirely the second trope. I propose a split. One is the rather game specific trope of having two nearly identical games with some exclusive content that requires playing both games to get all of. The second is a generally applicable trope of works that are meant to be considered a single whole that are split into multiple parts.
Actually, do we already have that second one? It seems common enough that we would.
edited 1st Aug '12 10:30:58 AM by petrie911
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