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
Multiverse chaos drives the plot
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Each film turns alternate worlds into the problem, not just the backdrop. The characters have to survive choices, variants, or timelines colliding around them.
medium
Opened on Memorial Day weekend
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hard
Fictional music groups drive the plot
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These films make a made-up band or performance group the engine of the story. The gigs, rehearsals, rivalries, and songs are not decoration. They are the plot machinery.
tricky
Split adaptations with Part in the title
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Each movie is part of a screen version that divides one source novel into more than one theatrical release. The title even admits the split with a Part label.