# Are there Sudoku puzzles that Cannot be solved?

## Are there Sudoku puzzles that Cannot be solved?

Nope, it’s impossible. By definition, a Sudoku puzzle has one and only one solution. If you find something that looks like a Sudoku but has multiple solutions — or none — it is not an actual Sudoku puzzle.

## Is there an app to solve Sudoku puzzles?

Google’s Goggles app for Android will now solve your Sudoku puzzle in less than 30 seconds. Sure, it’s a pointless application of the tech, but it looks really cool scanning the numbers and solving the puzzle and that’s the whole point.

Do some Sudoku puzzles have multiple solutions?

A Sudoku puzzle can have more than one solution, but in this case the kind of logical reasoning we described while discussing solving strategies may fall short. It turns out that for a Sudoku of rank n, at least n2-1 distinct symbols must be used for the puzzle to have a unique solution.

### How do you know if a Sudoku has a unique solution?

Given a Sudoku puzzle (that is, some of the squares are filled in with numbers), it has a “unique solution” if it can be legally completed in only one way. That is, it is a “solution” because it obeys the rules of Sudoku: no repeated digits in any row, column, or 3×3 square.

### Is Sudoku always solvable?

All Sudoku puzzles are solvable only through logical deductions, with no guessing. Some hard Sudoku puzzles may require deductive techniques that you don’t know. Some very hard Sudoku puzzles may require techniques that are so complicated that no human can do them without taking extensive notes.

How many puzzles can exist not solved solutions but puzzles?

What people are responding is a number of possible solutions, the final fully solved grid (not the possible number of problems). The total number of possible Sudoku solutions is 6,670,903,752,021,072,936,960, however, a really big number of these solutions are symmetrical.

#### Is regular sudoku a nonomino puzzle?

Since the 3×3 groups in regular Sudoku are themselves nonominos, regular Sudoku is a proper subset of nonomino Sudoku. How do you solve nonomino Sudoku puzzles?

#### How do you use a Sudoku solver?

About this Sudoku Solver. This solver offers a number of features to help you improve your solving skills and practice solving strategies. Enter the numbers of the puzzle you want to solve in the grid. You can solve the puzzle completely, partially or solve a single cell using the buttons in the Solving section of the Features block.

What is the difference between Sudoku and jigsaw puzzle?

Jigsaw Sudoku Puzzles Jigsaw Sudokus (also known as Irregular, Nonomino, or Geometric Sudoku) are very similar to regular Sudoku puzzles, but instead of 3×3 blocks, they are divided into irregular jigsaw-like shapes. Each row, column and jigsaw shape contains all of the digits 1 thru 9.

## What are the non-standard variations of Sudoku?

But of all the different non-standard variations, the one that appeals to me the most is nonomino Sudoku, also known as geometric Sudoku. This variation most closely approximates regular Sudoku, but instead of nine 3×3 groups, it has nine groups in irregular nonomino shapes. Since the 3×3 groups in regular Sudoku are themselves nonominos,…

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