## What is the hardest sudoku puzzle ever?

## How hard are expert Sudokus?

Expert Killer Sudoku is probably one the hardest number puzzles out there. It's **tremendously hard to solve**, but it feels as much as rewarding when you're done with it. ... Even if you're a Sudoku whiz, chances are you still aren't quite as fast at solving Sudoku puzzles as the Guinness World Record holder.

## Does sudoku increase IQ?

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**.**Aug 1, 2018

## Is Killer Sudoku harder than Sudoku?

Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic; **the hardest ones, however, can take hours to crack**.

## Are there unsolvable Sudoku?

Has anyone ever seen an unsolvable Sudoku? - Quora. **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.

### Related questions

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### 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.

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### How do you solve hidden triples in Sudoku?

If you're looking for hidden pairs, you're looking for two numbers which only exist in two cells within that area – even though there will be other candidates in the same cell “hiding” them. For triples, you'll be looking for **three cells**, and so on.

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### 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. ... The 5 and 9 only occur in those two squares and nowhere else in the row, so those two squares can only contain 5 and 9 and no other numbers.Aug 15, 2021

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### How long does it take to solve hard Sudoku?

Normally it takes **4–6 minutes**, but the really hard ones sometimes take 15 minutes to be solved.

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### Who is the best Sudoku player?

Of the 13 championships held so far, **Kota Morinishi of Japan (2014, 2015, 2017 and 2018)** has been the most successful winner with four individual titles, over Thomas Snyder of United States (2007, 2008 and 2011), Jan Mrozowski of Poland (2009, 2010 and 2012) who have each won three.

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### What is a fastest Sudoku time?

According to Guinness World Records, the fastest time to complete a “Very Easy” difficulty Sudoku puzzle was **1 minute 23.93 seconds**. The record was set on May 20, 2006 by Thomas Snyder, an American Sudoku champion.

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### Why is Sudoku bad?

**Sudoku Can Increase Frustration Levels**.

This has been known to cause a great deal of frustration for newbies. Even long-term Sudoku players can experience increased frustration when they level up to the next difficulty or encounter a puzzle that they just can't solve.

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### What does it mean if I am good at Sudoku?

One of the most common traits of Sudoku pros is **quick-learning ability** and of course, the ability to pick up on a pattern quickly. Being able to immediately recognize patterns means that a player can spot an opportunity with ease, and can almost predict or anticipate the number needed on the grid.