# How to solve sudoku when stuck?

## Is there a way to solve Sudoku without guessing?

Sudoku is a puzzle involving logic – no arithmetic or guessing is required! The basic idea of completing puzzles is to find cells ( the small squares) where you are sure that only one value is a valid placement. If you’ve not played Sudoku before, take a look at our guide to how to start.

## What is the swordfish technique in Sudoku?

The Sudoku Swordfish strategy is a single-candidate technique that uses 3 rows and 3 columns. This means the player only needs to focus on one digit. The grid must contain 3 rows or 3 columns where the digit is a candidate to only 2 or 3 cells.

## 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.

## Is there a formula for Sudoku?

For example, in the first and fourth columns beginning from the left of the 9×9 grid, we can form the following equations: m+n=a, g+n+f=g+c. In the second and last rows beginning from the top of the 9×9 grid, the following equations can be formed: b+g+f=a+g, e+n+m=a+b+d.

## What is the digit rule in Sudoku?

In a sudoku region each digit appears exactly once. For example, if a digit appears in a row, it cannot be in any other cell in the row. Likewise, each digit can appear in a cage only once. If a digit is in a cage, it cannot appear in that cage again.

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## Is sudoku good for brain?

Taking a short break and keeping your brain active instead of shutting it down might help you relax and manage stress. In short, while Sudoku isn’t a miracle cure, it is a fun and relaxing game that can help you keep your brain active and pass the time.

## What is a hidden pair in Sudoku?

A hidden pair occurs when a pair of numbers appears in exactly two squares in a row, column, or block, but those two numbers aren’t the only ones in their squares. In the above example, the 5 and 9 in red are a hidden pair.

## How do I get faster at Sudoku?

Focus on only one part of a square, row, or column rather than worrying about the entire grid all in one go. Slowly work your way up until you fill up all 81 spaces. You can start with a single square, then a row, then a column. Getting rid of all other distractions will help you solve the Sudoku grid much faster.

## Can a Sudoku have 2 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 n 2 -1 distinct symbols must be used for the puzzle to have a unique solution.

## What is a jellyfish in Sudoku?

A Jellyfish is where four columns have a candidate in only four different rows, or vice versa. This is like an X-Wing or Swordfish expanded into four units. Thus, all other 4’s in columns 1, 5, 7 and 9 (highlighted in green) can be eliminated. Sudoku Snake gives Jellyfish a skill value of 260.

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## Does Sudoku make you smarter?

Brain training games do not make you smarter, according to scientists. Practising a game like sudoku or using a brain training app might make you better at it but it won’t boost your IQ or general brain power, a study claims.

## Can all Sudoku puzzles be solved with logic?

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.

## Are some Sudoku puzzles unsolvable?

Nope, it’s impossible. By definition, a Sudoku puzzle has one and only one solution. If you personally can’t solve a particular puzzle, that doesn’t make it unsolvable.