Defining riddles precisely is hard and has attracted a fair amount of scholarly debate. The first major modern attempt to define the riddle within Western scholarship was by Robert Petsch in 1899, [5] …

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 …

For example, a text may place restrictions on its vocabulary, e.g. Basic English, copula-free text, defining vocabulary for dictionaries, and other limited vocabularies for teaching English as a second …

A puzzle hunt (sometimes рuzzlehunt) is an event where teams compete to solve a series of puzzles, many of which are tied together via metapuzzles. Puzzlehunt puzzles are usually not accompanied …

One example is if you ask "Alexa, do you know GLaDOS?", Alexa will reply with "We don't really talk after what happened". This is a nod to the Portal video game franchise.

The "Rosebud" puzzle is a prime example of this: in this puzzle 6 pieces have to be moved from one extreme position, in which they are only touching at the corners, to the center of the completed object.