Sudoku is the most popular logic puzzle in Japan also known as Suduko, Sudoko,
Su do ku, Sodoku, Suduku. It is very simple to learn, requires no calculations,
and provides a surprisingly wide variety of logic situations. From children to
old can enjoy it for a pass-time. The game refers to a number placement puzzle
also known as Number Place in USA. First Japanese title of this puzzle is "Suuji
wa dokushin ni kagiru". It's means that number is limited only single
(unmarried). But this title is too long, then it was abbreviated as "Sudoku". So
"SU" means number, "DOKU" means single. The puzzle seems to have first been
published in the USA before being noticed and then popularised in Japan.
The rules of the puzzle are simple. Each row, column and minibox comprises the
numbers 1 through 9. The solver must complete the missing numbers. The
attraction of the puzzle is that the completion rules are so simple and yet the
overall task can be difficult.
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