Ripple Effect (
Japanese
Japanese may refer to:
* Something from or related to Japan, an island country in East Asia
* Japanese language, spoken mainly in Japan
* Japanese people, the ethnic group that identifies with Japan through ancestry or culture
** Japanese diaspor ...
:波及効果 ''Hakyuu Kouka'') is a
logic puzzle published by
Nikoli. As of 2007, two books consisting entirely of ''Ripple Effect'' puzzles have been published by Nikoli. The second was published on October 4, 2007.
Rules
''Ripple Effect'' is played on a rectangular grid divided into
polyomino
A polyomino is a plane geometric figure formed by joining one or more equal squares edge to edge. It is a polyform whose cells are squares. It may be regarded as a finite subset of the regular square tiling.
Polyominoes have been used in po ...
es. The solver must place one positive
integer
An integer is the number zero (), a positive natural number (, , , etc.) or a negative integer with a minus sign ( −1, −2, −3, etc.). The negative numbers are the additive inverses of the corresponding positive numbers. In the language ...
into each cell of the grid - some of which may be given in advance - according to these rules:
* Every polyomino must contain the consecutive integers from 1 to the quantity of cells in that polyomino inclusive.
* If two identical numbers appear in the same row or column, at least that many cells with other numbers must separate them. For example, two cells both containing '1' may not be orthogonally adjacent, but must have at least one cell between them with a different number. Two cells marked '3' in the same row or column must have at least three cells with other numbers between them in that row or column, and so on.
History
Ripple Effect is an original puzzle of Nikoli; it first appeared in
Puzzle Communication Nikoli #73 (May 1998).
See also
*
List of Nikoli puzzle types is a Japanese publisher that specializes in games and, especially, logic puzzles. ''Nikoli'' is also the nickname of a quarterly magazine (whose full name is ''Puzzle Communication Nikoli'') issued by the company in Tokyo. ''Nikoli'' was establis ...
Ripple Effect Puzzle: The mobile game
External links
* http://www.nikoli.co.jp/en/puzzles/ripple_effect.html (English Version)
http://www.nikoli.co.jp/ja/puzzles/ripple_effect/ (Japanese Version)
{{DEFAULTSORT:Ripple Effect (Puzzle)
Logic puzzles