Master Sudoku Game - Play Free Sudoku Games Online
At Sudoku, each row, column and 3x3 sector must contain the numbers from 1 to 9. You don't have to guess to solve a Sudoku Puzzle. Every solution is unique and logical. Checking numbers helps you to figure out what to do first. Look at rows and columns. There are many solving tips and algorithms. Try to figure out some by yourself while solving the puzzles. In Master Sudoku you get to challenge yourself to three difficulty modes. Try to complete each puzzle as quickly as possible. Have fun!
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Sudoku Competitions
The first World Sudoku Championship was held in Lucca, Italy, from March 10 to 12, 2006. The winner was Jana Tylova of the Czech Republic. The competition included numerous variants. The second World Sudoku Championship was held in Prague from March 28 to April 1, 2007. The individual champion was Thomas Snyder of the USA. The team champion was Japan.
The Mathematics of Sudoku
A completed Sudoku grid is a special type of Latin square with the additional property of no repeated values in any of the 9 blocks of contiguous 3x3 cells. The relationship between the two theories is now completely known, after it was proven that a first-order formula that does not mention blocks (also called boxes or regions) is valid for Sudoku if and only if it is valid for Latin Squares (this property is trivially true for the axioms and it can be extended to any formula). The arrangement of numbers in Sudoku puzzles have greater Shannon entropy than the number arrangements in randomly generated 9x9 matrices. This is because the rules of Sudoku exclude some random arrangements that have an innate symmetry. The general problem of solving these puzzles on n2 x n2 boards of n x n blocks is known to be what mathematicians refer to as NP-complete.