Spoilers ahead: for the puzzle and the movies/games
This page reveals all categories and answers for this puzzle. It also discusses plot details, story endings, and other spoilers for some of the movies/games shown.
easy
Titles Naming Creatures Or Nonhuman Beings
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The connection is right in the titles: a frog, a mummy, a fly, and a thing. The joke is that every title starts the same way, but the useful clue is what each title names after that.
medium
Adapted From Modern Fiction
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hard
Satires Of Appetite And Excess
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Each film is about wanting too much and building a whole world around that hunger. Money, status, food, youth, beauty, and power all become things people consume until the appetite starts consuming them back.
tricky
The Real Setup Is Hidden
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Each film starts from a situation that looks easier to understand than it is: a mansion visit, a reunion between musicians, ordinary reality, or a cabin trip. The real machinery is hidden until the story lets you see who built the trap.