What is the minimum clues for 4x4 Sudoku?

A minimal Sudoku is one with the fewest number of starting clues. For 1x1 Sudoku of order n=1, the minimum number of starting clues is 1. For 4x4 Sudoku of order n=2, the minimum number of starting clues is 4.

What is the minimum number of Sudoku clues?

Puzzles must have at least 17 clues to have a valid solution.

What are the possible combinations for 4x4 Sudoku?

There are 6,670,903,752,021,072,936,960 possible solvable Sudoku grids that yield a unique result (that's 6 sextillion, 670 quintillion, 903 quadrillion, 752 trillion, 21 billion, 72 million, 936 thousand, 960 in case you were wondering). That's way more than the number of stars in the universe.

How do you solve a 4x4 Sudoku puzzle?

Is it not allowed to repeat numbers in the diagonal in the 4x4 Sudoku game?

Rules for Solving Diagonal Sudoku

You can't repeat any of the numbers in a single row. The numbers 1–9 must appear exactly once in each column. The 9 vertical columns have 9 cells each, so every number will only fit once.

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How many possible combinations does a 4x4 have?

The 4x4x4 Rubik's cube (called the Master Cube, or Rubik's Revenge – not sure who he was avenging, I must say) has 7 401 196 841 564 901 869 874 093 974 498 574 336 000 000 000 combinations (that is, 7.4 quattuordecillion, if you really wanted to know).

What is Sudoku 4 cell rule?

Rules of Quadruple Sudoku

The object of the puzzle is to fill in the whole 9x9 grid with numbers 1 through 9 (one number per cell) so that each row, each column, and each of the nine 3x3 boxes contains all the nine different numbers 1 through 9. The clues are in the form of sets of four special clue-numbers.

Can there be 2 solutions to a Sudoku puzzle?

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 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 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 is the lowest common multiple Sudoku?

Rules of LCM Sudoku

The numbers at the end of the rows and at the bottom of the columns are the Lowest Common Multiples (LCM) of the letters in that row. The LCM of the variables b, w, m and c in the fourth row is 504. As an example, the LCM of 8, 9, 6, 4, 2, 5 and 7 is 2520.

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).

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 hidden triple rule 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.

What is the L rule in Sudoku?

The L pattern exists when there is a wall that has one populated cell adjacent to it. The wall and the adjacent cell must be in the same box.

Is Sudoku good for the brain?

Sudoku keeps your brain active and reduces the risk of Alzheimer's, a most common cause of dementia that affects a person's thinking and behavioural skills. Stimulates your mind: The game works on your logical thinking process as you are absorbed in solving a puzzle and eventually improve your number skills.

How many moves does it take to solve a 4x4?

He proved that it requires at least 20 moves to solve. This can be performed using an algorithm.

What are the odds of guessing a 4 digit combination?

Thus, if you picked a 4-digit number randomly, you'd have a one in 10,000 chance of picking that number (or any other specific 4-digit number).

Can the same number be in the same spot in Sudoku?

Sudoku puzzles cannot have the same number twice in any row, column or box (container). You can take advantage of this by using deduction to determine (1) which numbers are missing, and (2) where the missing numbers go.

Can the same number be next to each other in Sudoku?

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.

Where are the hidden quads in Sudoku?

The Hidden Quad is {1,4,6,9} in Box 5 and exists only in the four cells [D4,D6,F4,F6]. Therefore other candidates (red text on yellow background) can be removed. This very special puzzle also produces a perfectly formed Empty Rectangle later on.

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!