Crossword

The crossword is the most common variety of word puzzle in the world. Modern crosswords take the form of a square grid of black and white squares; the aim is to fill the white squares with letters, forming words (or word phrases) reading across and down, by solving clues which yield the words. The black squares (commonly called "blanks") have no letters, and are used to separate words (all contiguous blocks of white squares spell words or phrases). Squares in which answers begin are numbered, left to right, top to bottom. The clues are then referred to by these numbers (ambiguities are resolved by the common practice of referring to clues by both number and direction – for example, "1-Across" or "17-Down"); at the end of the clue the total number of letters is sometimes given for the convenience of the solver, although in many widely distributed American crosswords such as the New York Times and Dell Magazines this is often omitted.

Major crossword variants

These are common crossword variants which vary more from a regular crossword than just an unusual grid shape or unusual clues; these crossword variants may be based on different solving principles and require a different solving skill set.

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Cipher crosswords

Published under various trade names, and not to be confused with cryptic crosswords (which happens due to ciphertext puzzles being commonly known as cryptograms), a cipher crossword replaces the clues for each entry with clues for each white cell of the grid - an integer from 1 to 26 inclusive is printed in the corner of each. The objective, as any other crossword, is to determine the proper letter for each cell; in a cipher crossword, the twenty-six numbers serve as a cipher for those letters: cells that share matching numbers are to be filled with matching letters, and no two numbers stand for the same letter. All resultant entries must be valid words. Usually, at least one number's letter is already given at the outset. Cipher crosswords are always pangrammatic (all letters of the alphabet appear in the solution). As these puzzles are closer to codes than quizzes, they require a different skillset; many basic cryptographic techniques, such as determining likely vowels, are key to solving these. Given their pangrammaticity, a frequent start point is locating where 'Q' and 'U' must appear.

Related Topics:
Cryptograms - Cipher - Pangrammatic

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Diagramless crosswords

In a diagramless crossword, often called a diagramless for short, the grid offers overall dimensions, but it is unnumbered and the black squares' locations are unspecified. A successful solver must deduce not only the answers to individual clues, but how to fit together partially built-up clumps of answers into larger clumps with properly set black squares. Some of these puzzles follow the traditional symmetry rule, others have left-right mirror symmetry, and still others have outlines suggesting other shapes.

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Fill-in crosswords

A fill-in crossword features a grid and the full list of words to be entered in that grid, but does not give explicit clues for where each word goes. The challenge is figuring out how to integrate the list of words together within the grid so that all intersections of words are valid. Fill-in crosswords may often have somewhat longer word length than regular crosswords to make the crossword easier for the solver, as fitting together several long words is easier than fitting together several short words because there are fewer possibilities for how the long words intersect together.

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