Metapuzzle
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A metapuzzle is a puzzle that unites several puzzles that feed into it. For example, five puzzles that had the answers BLACK, HAMMER, FROST, KNIFE, and UNION would lead to the metapuzzle answer JACK, which combines with all of those words to make new words and phrases.
A "meta-meta" unites several metapuzzles. So if that metapuzzle answer JACK was alongside three metapuzzles with the answers TEN, QUEEN, and ACE, the meta-meta answer would be KING, the remaining card in an ace high straight.
Metapuzzles are frequently found in a puzzlehunt.
The structure of a metapuzzle often makes it possible to guess, with a greater or lesser degree of certainty, the solutions to the puzzles that feed into it without solving them. This technique is called backsolving. For instance, in the above example, after solving the puzzles whose answers were BLACK, HAMMER, FROST, and KNIFE, and the metapuzzle answer JACK, a backsolver might, instead of solving the fifth puzzle, correctly guess UNION as its answer simply based on the knowledge that it must form a word or phrase with JACK. Backsolving is not infallible; the same backsolver might incorrectly guess SPRING-HEELED as the answer just as easily as correctly guessing UNION.