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Quoting from Wikipedia page:
Sudoku [...], sometimes spelled Su Doku, is a placement puzzle, also known as Number Place
in the United States. The aim of the puzzle is to enter a numeral from 1 through 9 in each cell
of a grid, most frequently a 9×9 grid made up of 3×3 subgrids (called "regions"),
starting with various numerals given in some cells (the "givens"). Each row, column
and region must contain only one instance of each numeral.
Please refer to the link above for further info and links about SuDoKu.
Moreover, you can find additional info on Kanji here and a complete site on Kanji-SuDoku kanji-sudoku.com.
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