Sudoku

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Introduction

The Classic Sudoku is a number placing puzzle based on a 9×9 grid with several given numbers. The object is to place the numbers 1 to 9 in the empty squares so that each row, each column and each 3×3 box contains the same number only once.

Sudoku puzzles come in endless number combinations and range from very easy to extremely difficult taking anything from five minutes to several hours to solve. Sudoku puzzles also come in many variants, each variant looking differently and each variant offering a unique twist of brain challenging logic.

However, make one mistake and you’ll find yourself stuck later on as you get closer to the solution… Try these puzzles, and see if you can solve them too!

Classic Sudoku

Each puzzle consists of a 9×9 grid containing given clues in various places. The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column and 3×3 box.

Classic Sudoku puzzle Classic Sudoku solution

(Special thanks to Concept is Puzzles).

Variants

In Competitive Sudoku, the rules of classical Sudoku will be used in addition to various settings as written by the puzzle composers prior to the event. Examples of variants are as follows:

Sum Sudoku

Each puzzle consists of a 9×9 Sudoku grid containing areas surrounded by gray or dotted lines. The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column and 3×3 box, and the sum of the numbers in each area is equal to the clue in the area’s top-left corner. In addition, no number may be used in the same area more than once.

Sum Sudoku

 

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Official Links

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World Puzzle Federation