What determines the difficulty of a Sudoku?

6 Answers. Modern sudoku puzzles are ranked according to the difficulty of the techniques required to generate a solution.

How is puzzle difficulty determined?

Piece Count This is the easiest part of determining the difficulty of a jigsaw puzzle. Puzzles come in a large variety of piece counts. Common sizes include 300, 500, and 1,000. Generally speaking, the higher the piece count, the harder the puzzle is.

How are Sudoku puzzles graded?

Sudoku puzzles are graded according to difficulty and this grading is essentially giving you an anatomy of the problem: many puzzles are very easy to solve (grade: easy, moderate) with a bit of logic. However, when one gets to the harder puzzles (grade: hard, very hard, evil) all the simple methods fail.

Which level of Sudoku is the hardest?

Expert level Sudoku
Expert level Sudoku This hardest Sudoku puzzle is characterized by the fact that only a few numbers are shown in the Sudoku square, which consists of 9 small squares, where the cells are located 3×3.

What is the best strategy for Sudoku?

The most basic strategy to solve a Sudoku puzzle is to first write down, in each empty cell, all possible entries that will not contradict the One Rule with respect to the given cells. If a cell ends up having only one possible entry, it is a “forced” entry that you should fill in.

What is a hard Sudoku?

Difficult Sudoku is for advanced players! Hard Sudoku is characterized by the fact that cells contain much fewer numbers than simple or medium ones. To solve hard level Sudoku puzzles, you should already know some tactics and tricks.

How hard is hard Sudoku?

An interesting corollary is that no Sudoku puzzle is known with a difficulty of 4. And the number of clues is not always a good measure of difficulty either. Ercsey-Ravasz and Toroczkai say they tested many puzzles including several with the 17 clues, the minimum number, and a few with 18 clues.