FREE
ONLINE SUDOKU PUZZLES
Sudoku
is a logic-based number placement puzzle. The objective
is to fill a 9×9 grid so that each column, each
row, and each of the nine 3×3 boxes (also called
blocks or regions) contains the digits from 1 to 9 only
one time each. The puzzle setter provides a partially
completed grid. Completed Sudoku puzzles are usually
a type of Latin square with an additional constraint
on the contents of individual regions. Leonhard Euler
is sometimes incorrectly cited as the source of the
puzzle, based on his work with Latin squares. The modern
puzzle was invented by an American architect, Howard
Garns, in 1979 and published by Dell Magazines under
the name "Number Place". It became popular
in Japan in 1986, after it was published by Nikoli and
given the name Sudoku, meaning single number. It became
an international hit in 2005. |
