A particular example was the Ramstein Air Base Telephone Directory, published between 1969 and 1973 (currently out of print). The US and NATO versions had differences, and the translation was …

A combination puzzle, also known as a sequential move puzzle, is a puzzle which consists of a set of pieces which can be manipulated into different combinations by a group of operations.

Daphnis recounting the tale of Echo to Chloe. (François Boucher, 1743, The Wallace Collection, London) The tale of Daphnis and Chloe is a 2nd-century romance by Greek author Longus. At one …

Narcissus and Echo (45–79 AD), wall painting from Pompeii Echo and Narcissus (1903), a Pre-Raphaelite interpretation by John William Waterhouse Narcissus & Echo (2006–2022), a modern-day …

Some word search puzzles are snaking puzzles, in which the word is not a straight vertical, horizontal, or diagonal line, but "bends" at 90 degrees at any given letter.

The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It was first published in 1969 by Hans Freudenthal, [1][2] …

An example Jumble-style puzzle Jumble is a word puzzle with a clue, a drawing illustrating the clue, and a set of words, each of which is “jumbled” by scrambling its letters. A solver reconstructs the words, …

Diagram showing the basic principle of echo sounding Distance is measured by multiplying half the time from the signal's outgoing pulse to its return by the speed of sound in water, which is approximately …