Is it cheating to use notes in Sudoku?

Hard Sudoku puzzles can prove to be impossible to solve without the visual aid provided by notes, due to the increased number of candidates per cell. It is not about cheating. It is about providing the opportunity for the brain to analyze several options and paths all at once and stimulating its cognitive development.

What should you not do in Sudoku?

Ignoring Squares

Sudoku is a game of placing numbers 1-9 in empty spaces within the same row, column or square – however, many beginning Sudoku players make the mistake of only focusing on rows (horizontal) or columns (vertical).

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 pencil marking in Sudoku?

What is pencil marking? In sudoku, pencil marking involves writing small numbers in each single cell of every possible number that cell could contain.

What is the rule of 3 in Sudoku?

"Hidden triples" applies when three cells in a row, column, or 3x3 block contain the same three Notes. These three cells also contain other candidates, which may be removed from them.

Sudoku Notes - the Benefits of using Notes while solving Sudoku

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.

What is the triplet rule in 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 a secret to playing Sudoku?

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.”

Does Sudoku benefit the brain?

Sudoku requires attention of the subject to analyze the grids and fill in the numbers; basically it requires no math but is based on logic [1]. Solving puzzles has long been thought to keep the brain healthy [2] and has been shown to delay the onset of dementia [3].

What happens if I solve a Sudoku daily?

The more you play, the better you become. If you play Sudoku daily, you will start to discover that you have almost a sort of “sense memory” for the puzzle grid – you will start to see patterns emerging and develop the ability to seize opportunities more quickly.

Do you need high IQ for Sudoku?

Do you need a high IQ for Sudoku? Sudoku does not require a high IQ to solve. It is a game of logic and strategy, not intelligence. So while a high IQ may make it easier to solve difficult puzzles, it is not a requirement.

Are you smart if you can solve Sudoku?

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.

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).

Can Sudoku have 2 answers?

A well-formed Sudoku puzzle is one that has a unique solution. 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.

What is the rule of two in Sudoku?

The game of Sudoku consists of a grid of nine rows and nine columns subdivided into nine 3x3 subgrids. It has two basic rules: Each column, each row, and each box (3x3 subgrid) must have the numbers 1 to 9. No column, row or box can have two squares with the same number.

What is the last possible number rule in Sudoku?

Last possible number is a simple strategy that is suitable for beginners. It is based on finding the missing number. To find the missing number you should take a look at the numbers that are already exist in the 3x3 block you are interested in, and in the rows and columns connected with it.

What are some Sudoku strategies?

The most common strategies for solving sudoku involve scanning rows and columns inside each triple-box region, removing numbers or squares, and identifying circumstances where just a single number can fit into a single square is the simplest approach to begin a sudoku problem.

What is the minimum time to solve Sudoku?

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

Is there a formula to solve 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 best algorithm to solve Sudoku?

The simplex algorithm is able to solve proper Sudokus, indicating if the Sudoku is not valid (no solution). If there is more than one solution (non-proper Sudokus) the simplex algorithm will generally yield a solution with fractional amounts of more than one digit in some squares.

How long does it take the average person to solve a hard Sudoku puzzle?

The average person takes more than a few minutes to solve a Sudoku. It requires patience, time, and attention. If you're not very patient by nature, you will likely find yourself very disappointed and annoyed with the game.

Is Sudoku a number or letter?

The aim of the puzzle is to fill the blank cells with the correct numbers and letters. Each row, column and 4 x 4 box must end up containing all of the numbers from 1 to 9 and all the letters from “a” to “g”.