What is the Sudoku world record 9x9?

A Sudoku Master from China Wang Shiyao solved 9x9 sudoku grid in 54.44 seconds at the World Sudoku & Puzzle Championship held in Prague. However...

What is the time complexity of 9 by 9 Sudoku?

Time Complexity : O( n ^ m ) where n is the number of possibilities for each square (i.e., 9 in classic Sudoku) and m is the number of spaces that are blank. where T(N) is the running time of the solution for a problem size of N. Solving this recurrence will yield, O(9^M).

Can a 9 * 9 Sudoku have multiple solutions?

Sudoku is a number puzzle consisting of a 9 x 9 grid in which some cells contain clues in the form of digits from 1 to 9. The solver's jobs is to fill in the remaining cells so that each row, column and 3×3 box in the grid contains all nine digits. There's another unwritten rule: the puzzle must have only one solution.

How many possible combinations of 9x9 Sudoku?

They discovered that the number of possible 9 by 9 Sudoku grids is N=6670903752021072936960 which is approximately 6.671×10²¹.

What is the Sudoku record?

The Guinness World Record for the fastest solve of a 'Very Easy' level Sudoku is held by American player Thomas Snyder. He completed the puzzle in a blazing 1 minute and 23.93 seconds!

Sudoku Tutorial #40 A must know technique.

Is Sudoku high IQ?

From this case study it can be concluded that an individual who is skilled at solving Sudoku puzzles likely has a high general IQ. The results of the weak correlation between Sudoku scores and the WAIT test indicates that in some cases a high Sudoku doesn't necessarily mean a high general IQ.

Is Sudoku a high IQ game?

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. And instead, researchers suggest people exercise more, socialise and make sure they get enough sleep if they want their mind to be sharper.

Is there 16 * 16 Sudoku?

16 x 16 sudoku puzzles work just the same as regular 9 x 9 sudoku puzzles, but they are, well, a lot bigger! Infact whereas a normal sudoku has 81 squares in it, a 16x16 sudoku has 256 squares in it, so you get a lot more puzzle for your money.

Are 1 and 9 consecutive in Sudoku?

Consecutive Sudoku Rules

The rules of Consecutive Puzzles are as follows: Place the numbers 1-9 once in each row, column and 3x3 bold-lined box in the grid. Green bars between squares indicate that the values in those squares are consecutive.

What is the 45 rule in Sudoku?

The 45 rule is a basic solving-technique in Killer Sudoku. Each house (row, column, nonet) must add to 45 (the sum of the digits 1 through 9).

What is the smallest solvable Sudoku?

An ordinary puzzle with a unique solution must have at least 17 clues, but this is not mathematically proven. There is a solvable puzzle with at most 21 clues for every solved grid, with the largest minimal puzzle found so far has 40 clues in the 81 cells. Similar results are known for variants and smaller grids.

What is Sudoku rule of 1?

Rule 1 - Each row must contain the numbers from 1 to 9, without repetitions. The player must focus on filling each row of the grid while ensuring there are no duplicated numbers. The placement order of the digits is irrelevant. Every puzzle, regardless of the difficulty level, begins with allocated numbers on the grid.

Is 6 minutes good for Sudoku?

5 minutes is more than enough time to jump start your brain, re-evaluate your Sudoku strategy, and develop a new perspective on how to view the Sudoku grid. So “take 5” and give yourself a new chance at solving Sudoku puzzles!

Is 7 minutes good for Sudoku?

The good sudoku time is one where one is able to solve a complex sudoku game which is in itself a combination of 5 or more sudokus. From the competition point of view, the lesser time one takes the better it is. For very hard say 5 to 7 minutes should be great.

What is the average time someone solved a Sudoku?

It is believed that the average Sudoku player spends approximately 20 minutes solving a typical Sudoku puzzle. For very hard puzzles, that number can be much higher. While the game itself can be challenging and complex, several strategies can be used successfully to find the solution.

How do you beat Sudoku without guessing?

There are more than a few techniques to solve a Sudoku puzzle, but per Conceptis Puzzles, the easiest way to a Sudoku solution is to, “Scan rows and columns within each triple-box area, eliminating numbers or squares and finding situations where only a single number can fit into a single square.”

What is the quickest Sudoku time?

A Sudoku Master from China Wang Shiyao solved 9x9 sudoku grid in 54.44 seconds at the World Sudoku & Puzzle Championship held in Prague. However...

What is the 159 rule in Sudoku?

Normal sudoku rules apply: Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each. 159: Digits in column 1 indicate the column in which the digit 1 appears in that row (e.g. if r4c1 is a 6, r4c6 is a 1).

What is the rule of 3 Sudoku?

If three candidates can be found in only the same three Cells of a region (Row, Column or Square), then one of these candidates is the solution for the first of these Cells, a second one is the solution for the second Cell and the last candidate is the solution for the third Cell.

Is there 0 in Sudoku?

The cool thing about this enigma is that only two possible answers can fill each blank: zero and one—and each grid has a sole solution.

Can Sudoku help ADHD?

This game not only improves attention, but it also improves math, focus, concentration, learning skills and memory. So if you're looking for games to improve attention for children with ADHD, give Sudoku a try!

What is Sudoku Killer level?

Hard Killer Sudoku levels have the same rules as any other level, the only difference is very few numbers on the grid from the beginning. This makes the game pretty hardcore and requires longer playing time to fill out all the numbers.