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How to play sudoku game for beginners

Sudoku 16x16, 25x25 and others can be solved in the same way.
To learn how to solve sudoku puzzles, you can follow these steps (below we will look at an example from the pictures):

1. Start by understanding the rules of sudoku:
  • A standard sudoku grid consists of 9 rows and 9 columns, divided into 9 smaller 3x3 boxes.
  • The grid will have some numbers pre-filled, called "givens".
  • The goal is to fill in the remaining empty cells with numbers from 1 to 9, ensuring that each number appears only once in each row, column, and 3x3 box.

2. Look for obvious/forced numbers:
  • Begin by examining each row, column, and 3x3 box to locate any numbers that appear only once.
  • Fill in these numbers as they are confirmed, as they will help eliminate possibilities in other cells.

3. Use the elimination technique:
  • Look for cells where only one number can fit based on the numbers already placed in the same row, column, or 3x3 box.
  • Cross out and eliminate the numbers that cannot go in those cells.
  • Repeat this process until no more numbers can be determined by elimination alone.

4. Apply the "only choice" technique:
  • Look for cells where only one number can be placed based on the numbers already in the same row, column, or 3x3 box.
  • Fill in these numbers, as they are the only choices available.

5. Try the "what-if" technique (if necessary):
  • If the puzzle becomes too challenging to solve using elimination and the only choice techniques, try making logical assumptions or guesses.
  • Choose a cell with a limited number of possible candidates and make an assumption.
  • Continue solving the puzzle based on that assumption and see if it leads to a contradiction.
  • If the assumption leads to a contradiction (e.g., two or more cells with the same number in a row, column, or 3x3 box), it is incorrect, and you can backtrack to the last correct state and try a different assumption.
  • If the assumption leads to a solution without contradictions, continue solving the puzzle.

Sudoku solution example

Let's take a simple Sudoku as an example.
Consider the top left 3x3 block.

We will iterate from 1.
Vertical: There is no 1 in the first and second columns.

Horizontally: The second and third lines also do not contain the number 1.
We cannot enter the number 1.
We continue the search.
Number 2 is already in the block.

Let's move on to number 3.
The image shows that the number 3 is already in the third line.
This leaves us with only one cell where we can add the number 3 (indicated by a green circle).

Enter the number 3.
We continue to go through 3x3 blocks, rows or columns to solve Sudoku.
Recommended for learning easy Sudoku.

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