For example, if the top row has an answer running all the way across, there will often be no across answers in the second row.
Another tradition in puzzle design (in North America, India, and Britain particularly) is that the grid should have 180-degree rotational (also known as "radial") symmetry, so that its pattern appears the same if the paper is turned upside down.
In such puzzles shaded squares are typically limited to about one-sixth of the total.
Arrows indicate in which direction the clues have to be answered: vertical or horizontal.
A crossword is a word puzzle that normally takes the form of a square or a rectangular grid of white and black shaded squares.
The goal is to fill the white squares with letters, forming words or phrases, by solving clues which lead to the answers.
they may not be orthogonally contiguous) and that the corner squares must be white.
The "Swedish-Style" grid (picture crosswords) uses no clue numbers, as the clues are contained in the cells which do not contain answers.
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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 (i.e.
In languages that 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. is part of both an "across" word and a "down" word) and usually each answer must contain at least three letters.