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.
Used for challenges that consist of multiple sub-challenges ("holes"), somehow combining the scores into one score. (Note: combining multiple unrelated challenges together is off-topic)
Involving calculation or other usage of factorials
For challenges relating to the encoding and decoding of data.
Challenges related to the arrangement, layout, or formatting of monospace plain text.
For challenges that require answers to perform network requests, etc.
related to the Brain-flak esoteric language and languages based on Brain-Flak. Note that challenges that require the answers to be in a specific language are generally discouraged.
related to crossword puzzles.
Challenge related to the concept of trees present in graph theory.
scored on some metric of their output.
For challenges relating to approximating constants/other numbers.
Used for challenges that require user interaction during their runtime
For challenges involving either three-dimensional graphics, three-dimensional geometry or spatial data structures in three dimensions (e.g. octrees).
For challenges related to the classic arcade game Tetris.
Fewest operations measures the number of specified "operations" performed at run time.
combination puzzles that involve moving flat pieces around to achieve a target configuration. Examples are 15-game or 2048.
The puzzle or challenge involves repeated application of some transformation to the input. These puzzles often involve mathematical sequences or fractals.
related to the Haskell language. Note that challenges that require the answers to be in a specific language are generally discouraged.
For challenges regarding fitting the most number of a certain shape into another shape, or for packing a number of a certain shape into the most compact form.
For challenges that involve error output, such as compiler/interpreter warnings or errors.
For challenges related to topology the mathematical study of open sets.
For challenges related to Morse code.
about or related to encoding a plaintext, usually with one or more keys.
exists for historical reasons. New challenges of the type previously posted under this tag are not welcome.
indicates that the challenge involves electrical components such as resistors in some way (e.g. counting the total resistance of a set of resistors).
For challenges asking participants to design a language or parts of a language.
Puzzles involving a word search - a word game that consists of the letters of words placed in a grid, which usually has a rectangular or square shape. Usually, the objective of this puzzle is to find…
directly related to solving, generating, or otherwise working with the minesweeper game.
the act of replacing one part of a string with another.
Challenges involving behaviour that depends on previous invocations of the solution.
is used for challenges specifically related to clocks and the display of absolute time. Usually it should not be used for challenges about relative time.
Tasks involving writing compilers for various languages or formalisms.
For challenges relating to the game of Boggle.
For challenges pertaining to a formal grammar often a context free grammar.
Problems involving programming an AI to play a game.
For challenges involving doing something at compile-time, rather than run-time. This means that only compiled languages can compete.
an open standard key-value pair data format. Use this tag for questions that involve parsing, outputting, or otherwise manipulating JSON objects.