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 makes use of chemical knowledge, such as the names and atomic numbers of chemical elements.
Puzzles about foreign alphabets and weird encodings.
characteristically worked out using a pencil and paper. Common examples include connect-the-dots, hangman, dots-and-boxes, fill-in-the-blank, and SOS. Note that crossword, S…
The answer to a problem may be known but it is not understood. These questions explicitly request additional details on how a problem is solved or why the current solution is appropriate.
A puzzle in which a seemingly impossible situation is presented, or any sort of construction that results in a logical contradiction.
For questions regarding how to get items or people across something obeying a set of rules.
For puzzles based on the movements of a knight piece in chess.
A puzzle that asks for finding the hidden pattern in a given word sequence.
A strategic puzzle centered around pouring liquids between containers of different capacities, with the goal of measuring exactly n liters.
a strategy-based puzzle game with hidden bombs in some cells. Certain other cells contain numbers to say how many bombs are adjacent to that cell. The object is to find all the bombs wi…
a tiling puzzle that requires the assembly of (often oddly shaped) interlocking and tessellating pieces.
A puzzle based on the folding of a piece of paper (also known as origami).
The history of puzzles and their creation, as well as any methodologies which have developed over time. For puzzles about history, use the [history] tag instead.
A puzzle centred around kinship, family ties, ancestry, relatives, blood ties and other family bonds.
Puzzles in the form of a haiku, a very short form of poetry, typically a three line observation on a certain topic.
For puzzles based on flags, flag patterns or flag usage.
a logic puzzle where the goal is to draw a loop so each number has that many edges of the loop adjacent to it.
is for all questions related to solving or discussing Rubik's Cube related puzzles.
A puzzle that involves and requires knowledge of prime numbers.
for questions about the board game Mastermind.
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 puzzle in which you need to find and follow links to successive i.stack.imgur images in order to progress.
a logic puzzle where the goal is to draw a single loop through every circle in a grid. A loop passing through a white circle must pass directly through it and make a turn on at least one side…
Current unsolved real-world puzzle
A puzzle about disentangling knots, folding paper, separating strings and wires, and understanding the connectivity properties of elastic figures.
Any puzzle where a team of pursuers must capture a team of targets, with movement limited to some given space. The goal is to find a winning strategy either for the pursuers or for the evaders.
A geometry puzzle centered around the triangle or the centers of a triangle.
A puzzle involving making connections between several clues in a list.
A puzzle involving a calculation from which some digits have been removed. Different from an [alphametic] in that it is not specified which digits are the same or different from each other.
For puzzles related to Magic: the Gathering trading card game. For example, these could involve challenges like winning from a given board state, or puzzles related to a specific card or deck.
A puzzle about flipping/tossing coins. Typical examples are about the probability that head or tail comes out.
A puzzle that involves arranging objects optimally in order to fit in a specified space.
For puzzles about using keys to open locks and doors.
Speedsolving typically refers to solving a physical puzzle as quickly as possible. For instance, one might use this tag when asking about optimal Rubik's cube algorithms. This tag is not necessarily l…
Puzzles centered around tic-tac-toe (a.k.a. noughts and crosses).
A strategy game in which players take turns to reduce the number of objects in some sets, the aim being either to remove the last object or _not_ to do so.