Sudoku Diagonal adds a new rule of diagonals to popular Sudoku. You can enjoy this new type of Sudoku more. Sudoku Diagonal is a fun and entertaining apps to help you develop and maintain brain. Roulette slot. Every Sudoku has a unique solution that can be reached logically. Enter numbers into the blank spaces so that each row, column and 3x3 box contains the numbers 1 to 9 without repeats. Enter numbers into the blank spaces so that each row, column and 3x3 box contains the numbers 1 to 9 without repeats.
<< Return to patterns page
Next pattern: opposite pattern >>
Introduction
The diagonal pattern can be found with only two numbers in a box. This pattern can help locate twins. If twins are found it can help find other numbers.
There can be more than two numbers in a box that has the diagonal pattern but only two numbers are needed for the diagonal pattern to exist.
Details
Diagonal Sudoku Aarp
When two numbers are kitty-corner from each other in a box, or in other words the corners of the numbered cells are touching, the diagonal pattern exists. See figure 1 below.
Figure 1
Diagonal Sudoku Pdf
Look at box 6 in figure 1. The 3 and the 8 form a diagonal pattern. This pattern allows us to look for twins. If twins are found they would be in the green circled cells.
Finding Twins
When this pattern is found look at the row and the column in the box that don't contain either of the two numbers (in this case row 6 and column 9). If you can find two numbers that are in both the row and the column and they aren't already in the box then you have found twins. Figure 1 has a 2 and a 5 in both row 6 and column 9 and therefore the green circled cells are 25 twins. Take a look at figure 1 and convince yourself that this is so.
The twins may or may not be solvable. If they can be solved the diagonal pattern becomes a corner pattern. There is still a corner pattern (a hidden one) if the twins can't be solved because no other numbers can fit in those two cells.
In this example the 25 twins are there but we can't solve them yet. But we can still find numbers. Read on.
Finding other numbers after twins
Now that we know the corner pattern is there we can look for other numbers. Notice the 1 in column 9. Because of the hidden corner pattern in box 6 we now know that the 1 is constrained to row 6 in box 6 (the cells with red circles). See figure 2 below.
Figure 2
Because of this we know that r6c5 must be a 6 and we also know we can now place the 6 in box 6. See if you understand why.
Extra Credit!
As an additional exercise see if you know where the 4 now goes in box 6.
Summary
As you can see the diagonal pattern can be helpful in a couple of ways. First it helps find twins. Second, whether those twins can be solved or not, it helps find other numbers.
Video about the diagonal pattern
This video talks about the diagonal pattern and shows examples of it.
Skill Levels
You can find the diagonal pattern in puzzles of any skill level. Harder levels will have fewer numbers so it will be harder to find the pattern. But as the puzzle progreses more numbers can yield more twins via the diagonal pattern.
In this example the 25 twins are there but we can't solve them yet. But we can still find numbers. Read on.
Finding other numbers after twins
Now that we know the corner pattern is there we can look for other numbers. Notice the 1 in column 9. Because of the hidden corner pattern in box 6 we now know that the 1 is constrained to row 6 in box 6 (the cells with red circles). See figure 2 below.
Figure 2
Because of this we know that r6c5 must be a 6 and we also know we can now place the 6 in box 6. See if you understand why.
Extra Credit!
As an additional exercise see if you know where the 4 now goes in box 6.
Summary
As you can see the diagonal pattern can be helpful in a couple of ways. First it helps find twins. Second, whether those twins can be solved or not, it helps find other numbers.
Video about the diagonal pattern
This video talks about the diagonal pattern and shows examples of it.
Skill Levels
You can find the diagonal pattern in puzzles of any skill level. Harder levels will have fewer numbers so it will be harder to find the pattern. But as the puzzle progreses more numbers can yield more twins via the diagonal pattern.
Next pattern: opposite pattern >>
<< Return to patterns page
If this website and YouTube channel have helped you, consider donating
Thanks in advance for your support!
Diagonal Sudoku Washington Post
More About Sudoku
Diagonal Sudoku Online
Sudoku - the puzzle that addicts
X Sudoku is also referred to diagonal Sudoku. It is another type of standard Sudoku. Based on standard Sudoku, diagonal Sudoku has more requirements. Numbers on two sides of diagonal lines have to be numbers from 1-9 and cannot be repeated. Since diagonal Sudoku has more requirements, the solving process is more challenging and interesting. It also has more requirements related to players' observation capacities.
The rules of X Sudoku (Diagonal Sudoku)
The solving process of diagonal Sudoku is to fill numbers from 1-9 in 9x9 grids. Numbers cannot be repetitive in each row, each column, each group (3x3 grids in rough-line boxes) and two sides of each diagonal line.
- Number 1-9 can only appear once in each column.
- Number 1-9 can only appear once in each row.
- Number 1-9 can only appear once in each group.
- Number 1-9 can only appear once on each diagonal line.
Printable Diagonal Sudoku puzzles (Daily update)
Aarp Sudoku Daily
This website will provide you printable Diagonal Sudoku puzzles, we daily update including solutions. We recommend using a A4 paper.
