A crossword is a word puzzle that normally takes the form of
a square or rectangular grid of black and white 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 black 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.
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