Lullaby Sudoku: How to Master Sudoku

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Lullaby Sudoku: How to Master Sudoku

News Category: Online Games - Related Game: Lullaby Sudoku - Genre: Puzzle

Lullaby Sudoku: How to Master SudokuWe will be showing the most basic to not so basic methods,tips and tricks to finish a sudoku. This manual is for anyone who plays or wants to play sudoku even if you don't know how to play.

We will be showing the most basic to not so basic methods,tips and tricks to finish a sudoku. This manual is for anyone who plays or wants to play sudoku even if you don't know how to play.

We are going to start with the very basics and slowly progress to some more advanced methods for solving any Sudoku puzzle.

Step 1: How to play sudoku

The basic Sudoku Grid

The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9.

A cell is the smallest block in the game. A row , column and region consists of 9 cells and the whole game consists of 81 cells. A region has thicker lines surrounding it. This simply makes it easier to play the game.

No Row, Column or Region may contain duplicate Numbers.

Step 2: The most basic Scanning Method

Sudoku Scanning Method 1

Sudoku Scanning Method 2

I most basic strategy to find missing numbers is scanning and it consists of (a) Cross-hatching and (b) Counting.

a. Crosshatching (shown in the first picture). You scan rows and columns to eliminate where a specific number can exist in a given region. As you can see there is only one legal place left for the 1 (marked green).

b. Counting. In counting you simply count all the different numbers that are in a row, column and region that connect to a single cell. if there is just one number missing then thats what should be in the cell. Take a look at the second picture and see if you can figure out the missing number in the green cell.

the correct answer is :4
legend: green = result, red = cause (the cause of the result that is)

Step 3: The analysis is a higher level method

Higher Level Sudoku Analysis Method

Analysis consists of two methods namely (a) candidate elimination and the (b) "what if" method.

We will not be showing the what if method because we don't like it, and it was never of any help in our ventures of solving a specific Sudoku Puzzle.

The Candidate Elimination. The method for candidate elimination we will be showing now is the matched pair method.This method happens when a pair of numbers are the only possible answer to two cells.

Take a look at the picture. We have concluded (with the help of cross hatching) that 7 and 8 can only exist in two cells in the lower left region (we filled both in) . The two cells which 7 and 8 can be in, is in the same column, thus it cannot be elsewhere in the column. There is two other blank cells in this column and the missing numbers is 9 and 3. We can see that 3 can not be in the "middle" open cell. This means 3 is in the top cell (marked green) and 9 is in the "middle" cell.

Candidate elimination can also be used with three number in three cells.

Note: Candidate elimination is note the fastest nor easiest method for determening the green cells answer. That is why one must first scan before analyzing . We will try to find a better example.

Step 4: Analysis - Deriving Certainty from Uncertainty

Sudoku Analysis Method - Deriving Certainty from Uncertainty

This method is almost like the candidate elimination we have shown in the previous step (its called deriving certainty from uncertainty).

Take a look at the picture below, focus on the center region. There are only two possible places where the 7 (and 2) can exist. There are three places for the seven in the middle right region, but can not be in the middle ones because 7 is reserved by the center region thus there is only one place left for the seven in the middle right region.

Step 5: XY-Wing - Avanced technique

XY Wing 1
XY Wing 2
XY Wing 3

The XY wing is the most difficult technique we have tried so far, simply because it is more difficult to spot it - and certainly to teach!

You will understand better if you check the pictures above. The method works by removing candidates.

The values in the blue squares will be assigned an x,y,z value, according to the numbers. In this manual the corresponding xyz values are: x=8 ; z=2 ; y=9. The green square with the red lining around it is a buddy (in the same row,column or region) of the blue block with 8,9 and the blue block 8,2, and the 9,2 blue block is a buddy of the 8,9 and 8,2 blue blocks. This means that 8 (which is also in the two blue buddy blocks) cannot be in the red lined block. If you are not sure why check within the following pictures. So now you know all about solving Sudoku Puzzles and it is good time to try your new skill by playing the all new Lullaby Sudoku, a Sudoku Puzzle that can be played and will relax you all at the same time!

Source: - Just Free Online Games

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