A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
A puzzle that involves and requires knowledge of prime numbers.
For puzzles of the form of "What do these three words have in common?"
In a 'blackboard puzzle' a set of numbers is transformed according to certain rules.
For questions related to the puzzle of islanders who can only leave when they deduce the colour of their own eyes.
A question about assessing or adjusting the difficulty level of a puzzle.
Raven's Progressive Matrices or similar puzzles: visual designs with a missing piece, often a 3x3 matrix with a corner missing, and a number of choices to pick from and fill in the missing piece
A bongard consists of mainly 6 boxes on the left and 6 boxes on the right. The task of a bongard problem is to discover a statement that describes the contents of each box on the left side, but does n…
A puzzle which involves networks. Often, such puzzle are in connection with mathematical graph-theory.
For puzzles that use an aspect of information theory - the processing and transmission of information.
A type of puzzle typically involving a grid of lights, in which the challenge is to get them all to the same state (on or off). The trick is that each light also affects a number of its neighbors, wi…
puzzle includes emoji in the question, often the goal of the questions involves deciphering their meaning.
Puzzles may involve a homonym, a word that is said or spelled the same way as another word but has a different meaning. A riddle may describe an almost impossible phenomenon where there are two disti…
a word, phrase, number, or other sequence of characters which reads the same backwards and forwards.
A puzzle asking about a proof (usually mathematical) expressed with diagrams and without words.
a chess problem in which one side, usually White, forces the the other side, usually Black, to checkmate them while the other side actively plays to avoid give checkmate. Please also tag…
A question about categories, mechanics, or effects of puzzle in general, or about scientific research on puzzles.
a well-known probability puzzle centered around three doors, two goats, and one car.
used for discussing the number of solutions of a puzzle type or a concrete puzzle.
a 2-player pencil-and-paper game in which the players take turns to fill in lines of a grid, claiming each square of which they fill in the 4th side. The aim is to claim as many squa…
a recreational activity in which locations, typically concealing hidden containers are found using a GPS enabled phone or similar device.
MathJax programming puzzles have solutions that are automatically rendered anew each time they are browsed. (MathJax is Puzzling's on-site facility for displaying mathematics and is capable of …
For questions about the game of Tetris, or puzzles which involve or relate to this game. Not for general puzzles involving tetrominoes, which may be tagged [polyomino] instead.
For use in puzzles where a specific order of events or decisions needs to be made.
Word game in which players score points by placing tiles, each bearing a single letter, onto a gameboard which is divided into a 15×15 grid of squares. The tiles must form words in crossword fashion.
a game, usually online, involving puzzles and ciphers hidden in mysterious videos, images or audio with a story behind them. Usually it is meant to promote a product.
A puzzle that involves seven-segment displays, more commonly referred to as "digital" displays.