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In this chart, novels are in blue, short stories are red.  Higher on the page is older, lower is more recent.  I would suggest additional colors for games and movies.  Audiobooks could have an additional color, as well, but I'm not sure.

You could stratify the chart into eras, which could help with the classification, and items could straddle different eras.

I guess if you need to force a nomenclature, I'm a fan of the SashaBGarza method. (A/B/C/D 10, 11, 20) When in doubt, ask a librarian.

Either way, if I get confused by a flat list, I want to take a look at some sort of chart to give me context.