Sudoku is a logic puzzle where players fill a 9x9 grid so that each column, row, and 3x3 box contains the numbers 1-9 without repeating. While similar puzzles appeared in newspapers in the 19th century, the modern Sudoku was likely designed in 1979 and introduced to Japan in 1984, where it was named by how the numbers must occur once in each region. The puzzle involves placing numbers into cells within the grid under these unique placement rules.

2. What is Sudoku?
 Sudoku is a logic-based number placement
puzzle.
 Its objective is to fill a 9x9 grid so that each
column, each row, and each of the nine 3x3
boxes contains the digits from 1 to 9.

3. History of Sudoku
 Back in the 19th century
 Le Siècle, a Paris-based daily newspaper
published a partially completed 9×9 magic
square with 3×3 sub-squares.
 There were still some similar characteristics
and within three years, the puzzle was refined
by La France, a rival newspaper, to almost the
Sudoku that we know now.

4. History of Sudoku
 As for this modern Sudoku, it‟s
believed to have been designed
in 1979 by Howard Garns, a
74 year old architect from
Indiana. It was then published
by Dell Magazines in its
magazine Math Puzzles and
Logic Problems, under the title
“Number Place.”

5. History of Sudoku
 The puzzle was introduced in Japan by Nikoli
in the paper Monthly Nikolist in April 1984.
 „Suji wa dokushin ni kagiru’
 “The numbers must occur once”
 The puzzle was named by Kaji Maki.

6. Sudoku Terminology
 Grid – the whole
puzzle area.
 Values – also called
“given”
 Cells – composed of 91
cells
 Blocks/Regions – each
of the 9 3x3 boxes