A crossword is a word puzzle that normally takes the form of a square or rectangular grid of white and shaded squares. The goal is to fill the white squares with letters, forming words or phrases, by solving clues which lead to the answers. In languages which are written left-to-right, the answer words and phrases are placed in the grid from left to right and from top to bottom. The shaded squares are used to separate the words or phrases.

Squares in which answers begin are usually numbered. The clues are then referred to by these numbers and a direction, for example, "4-Across" or "20-Down". At the end of the clue the total number of letters is sometimes given, depending on the style of puzzle and country of publication. Some crosswords will also indicate the number of words in a given answer, should there be more than one.

Terminology

The horizontal and vertical lines of white cells into which answers are written are commonly called entries or answers . The clues are usually called just that, or sometimes definitions . White cells are sometimes called lights , and the shaded cells are sometimes called darks , blanks , blocks , or just simply black squares or shaded squares .

A white cell that is part of two entries (both Across and Down) is called checked , keyed or crossed . A white cell that is part of only one entry is called unchecked , unkeyed or uncrossed .

The creating of crosswords is called cruciverbalism among its practitioners, who are referred to as cruciverbalists , from the Latin for cross and word . Although the terms have existed since the mid 1970s, non-cruciverbalists rarely use them, calling crossword creators constructors or (especially outside the United States) setters or compilers .

Types of grid

Crossword grids such as those appearing in most North American newspapers and magazines feature solid areas of white squares. Every letter is checked, and usually each answer is required to contain at least three letters. In such puzzles shaded squares are traditionally limited to about one-sixth of the design. Crossword grids elsewhere, such as in Britain and Australia, have a lattice-like structure, with a higher percentage of shaded squares, leaving up to half the letters in an answer unchecked. For example, if the top row has an answer running all the way across, there will be no across answers in the second row.

Another tradition in puzzle design (in North America and Britain particularly) is that the grid should have 180-degree rotational symmetry, so that its pattern appears the same if the paper is turned upside down. Most puzzle designs also require that all white cells be orthogonally contiguous (that is, connected in one mass through shared sides, to form a single polyomino).

The design of Japanese crossword grids often follows two additional rules: that shaded cells may not share a side and that the corner squares must be white.

The "Swedish-Style" grid uses no clue numbers - the clues are contained in the cells which would normally be shaded in other countries. Arrows indicate in which direction the clues have to be answered, vertical or horizontal. This style of grid is used in several countries other than Sweden, usually in magazines with pages of A4 or similar size. The grid often has a photo of a pop or movie star replacing a block of squares, as a clue to one answer. These puzzles usually have no symmetry in the grid.

Substantial variants from the usual forms exist. Two of the common ones are barred crosswords , which use bold lines between squares (instead of shaded squares) to separate answers, and circular designs, with answers entered either radially or in concentric circles. Free form crosswords have simple designs and are not symmetric. Grids forming shapes other than squares are also occasionally used.

Puzzles are often one of several standard sizes. For example, many weekday puzzles (such as the New York Times crossword) are 15×15 squares, while weekend puzzles may be 21×21, 23×23, or 25×25. The New York Times puzzles also set a common pattern for American crosswords by increasing in difficulty throughout the week: the Monday puzzles are the easiest and the puzzles get harder until Saturday. The larger Sunday puzzle is approximately the same level of difficulty as a weekday-size Thursday puzzle. This has led U.S. solvers to use the day of the week as a shorthand when describing how hard a puzzle is: i.e, an easy puzzle may be referred to as a Monday or Tuesday, a medium-difficulty puzzle as a Wednesday and a truly difficult puzzle as a Saturday .

Typically, clues appear outside the grid, divided into an Across list and a Down list; the first cell of each entry contains a number referenced by the clue lists. For example, the answer to a clue labeled "17-Down" is entered with the first letter in the cell numbered "17", proceeding down from there. Numbers are almost never repeated; numbered cells are labeled consecutively, usually from left to right across each row, starting with the top row and proceeding downward. Some Japanese crosswords are numbered from top to bottom down each column, starting with the leftmost column and proceeding right.

Some crosswords do not number the clues, but have their clues in small print inside grid cells which act as blanks, each clue with a little arrow indicating in which direction from its initial cell the answer is to be written. This kind of crossword originated in Scandinavia and has many different names: "Arrowwords", "Pointers," or "Tipwords" in English, Autodefinidos in Spanish, "Mots Fléchés" in French, etc, and are very popular, often being printed larger than conventional crosswords (to allow adequate space for printing the clues) and are much-used in competitions.

Orthography

Capitalization of answer letters is conventionally ignored. This ensures a proper name can have its initial capital letter checked with a non-capitalizable letter in the intersecting clue. Diacritical markings in foreign loanwords are ignored for similar reasons. In languages other than English, the status of diacritics varies according to the orthography of the particular language, thus:

  • in French, in Spanish and in Italian, accent marks and most other diacritical markings are ignored: for instance, in French, the final E of answer ÊTRE can double as the final É of CONGÉ when written ETRE and CONGE ;
  • in German language crosswords, the umlauts ä , ö , and ü are dissolved into ae , oe , and ue , and ß is dissolved into ss .
  • in Dutch crosswords, the ij digraph is considered one letter, filling one square, and the IJ and the Y (see Dutch alphabet) are considered distinct. Rules may vary in other word games.
  • in Spanish crosswords, although ch and ll were once considered one letter each, they fill two squares.
  • in Czech and Slovak, diacritics are respected and ch being considered one letter occupies one square.
  • in Irish crosswords, the accents on Á É Í Ó Ú are all respected, so (for example) the Í in SÍB cannot double as the I in SLIABH .
  • in Romanian, diacritics are ignored.
See also: Digraph (orthography)#Digraphs versus lettersSee also: Diacritic

Types of clues

Straight or quick

In some crosswords, often called straight or quick , the clues are usually simple definitions for the answers. Some clues may feature anagrams, and these are usually explicitly described as such. Often, a straight clue is not in itself sufficient to distinguish between several possible answers (often synonyms), and the solver must make use of checks to establish the correct answer with certainty.

Crossword clues should be consistent with the solutions. For instance clues and their solutions should always agree in tense and number. If a clue is in the past tense, so is the answer: thus "Traveled on horseback" would be a valid clue for the solution "RODE", but not for "RIDE". Similarly, "Family members" would be a valid clue for "AUNTS" but not "UNCLE". Some clue examples:

  • Fill-in-the-blank clues are often the easiest in a puzzle, and a good place to start solving, e.g., "__ Boleyn" = ANNE
  • A question mark at the end of clue usually signals that the clue/answer combination involves some sort of pun or wordplay, e.g., "Grateful?" = ASHES (since a grate might be full of them).
  • Most widely distributed American crosswords today (e.g., The New York Times, Washington Post, Boston Globe, USA Today, etc.) also contain colloquial answers, i.e., entries in the puzzle grid that try to replicate everyday colloquial language. In such a puzzle, one might see phrases such as WHAT'S UP , AS IF , or WHADDYA WANT .

In the hands of any but the most skilled constructors, the constraints of the American-style grid (in which every letter is checked) usually require a fair number of answers not to be dictionary words. As a result the following ways to clue abbreviations

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