The Logic of Sudoku

Sudoku is a logic puzzle where no calculations are applied.

A classic sudoku grid has nine rows and nine columns.

Nine 3 by 3 subgrids compose the main playing area.

Dell Magazines printed the modern form as Number Place in 1979.

Nikoli introduced the puzzle to Japan during April 1984.

Maki Kaji shortened the long Japanese name to sudoku in 1986.

Wayne Gould wrote a computer program generating puzzles over six years.

The Times of London launched sudoku on November 12, 2004.

Sky One broadcast the first live TV sudoku show in 2005.

The World Puzzle Federation organizes an annual championship since 2006.

Sudoku remains a pure logic puzzle needing zero arithmetic skills.