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The More Givens, the Easier the Puzzle, Right?

Not true. The quantity of givens does not always define the difficulty. A puzzle can be more difficult with 28 givens than say 17, if the relevance and placement of the givens is more complex. Sudoku puzzles are graded as easy, intermediate, hard, or challenging, depending on the type of logic that is required to solve them. The fewest number of givens needed for completion of a Sudoku game is believed to be 17.

According to scientific calculations, there are 6,670,903,752,021,072,936,960 possible solvable Sudoku grids based on the regular 9 x 9 pattern. There is no theoretical limit on the size of a Sudoku puzzle either—you just expand the squares: 16 x 16, 25 x 25, and so on. The important thing to remember is that in a correctly-formed pure-logic Sudoku puzzle, there can only be one solution. If you find yourself working a variant placement puzzle with more than one solution, then... Sign-up Above to Read More!

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