Mind-Blowing Sudoku X Puzzles That Will Crush Your Brain

Spread the love


Sudoku-X puzzles extend ordinary Sudoku puzzles with two additional diagonal sections.

This little alteration can frequently make the games significantly more difficult!.

It is a Sudoku variant with the added rule that each number from 1 to 9 can only occur once in each of the two main diagonals.

The name of this sudoku puzzle is derived from the fact that the two diagonals resemble the word X.

As Sudoku X is a variant of the popular number-placement puzzle Sudoku.

In Sudoku X, empty cells can be filled with any number from 1 to 9.

However, each row, column, and 3×3 region still contains the numbers 1 through 9 exactly once. Additionally, there are two special squares in the grid.

A black square and a white square.

The black square ensures that no number appears twice in any row or column, while the other is white square guarantees that no two identical numbers appear next.

Sudoku X is an interesting variation of the classic Sudoku game.

In Sudoku X, figures are arranged in a 9×9 grid instead of the usual 3×3 grid.

This results in a more complex puzzle that is still just as fun and challenging to solve.

So if you’re looking for a new puzzle to keep you occupied, be sure to give Sudoku X a try!

Sudoku X

How to solve Sudoku X 

As Sudoku-X is a new type of Sudoku puzzle that adds two extra diagonal sections, they become even more difficult. A few steps that can help to solve Sudoku x are below:

  • In order to solve Sudoku-X, you have to think about how to solve it instead of just assuming that you know how to do it. To do this, make small pencil marks on the grid to keep track of possible squares.
  • Consider the solved puzzle. Each row, column, and bold-lined rectangle is assigned a value between 1 and 6. The two marked diagonals are also on each row, column, and rectangle. A 9×9 puzzle would have a number from 1 to 9.
  • On puzzle mix, there are a lot of different Sudoku-X puzzles of different sizes and levels of difficulty. Most of the rows and columns in each bold-lined shape are 6×6, 8×8, or 9×9. The solutions are 2×3 for 6×6 puzzles, 4×2 for 8×8 puzzles, and 3×3 for 9×9 puzzles.
  • Sometimes there is a bigger Sudoku-X puzzle in the mix, like a 12×12 or 16×16 puzzle. So, each row or column must have the numbers 1–9 and either A–C or A–G in it, or both.

Play Online for free

Sudoku X Puzzle Rules

  • Use the numbers 1-9 to fill in each row, column, and 3×3 box in the grid. This is the most often encountered set of sudoku rules.
  • In addition, the grid contains two shaded diagonal sections that together create the letter ‘X.’ These regions must likewise only contain 1-9 once. This is Sudoku X’s additional rule.
  • A sudoku X puzzle features 29 regions instead of 27 in a conventional sudoku puzzle on a 9×9 grid.
  • The key to solving them is to remember that these two extra regions exist and use the information they supply to help you narrow down your squares possibilities and solve the puzzle.

Strategy and Solving Tips for Sudoku X Puzzles

All of our sudoku X puzzles have a single solution that can be found only via the application of logical rules; no guessing is required; here are some solution tips:

  • To solve a sudoku X puzzle, use the same logic as you would for conventional Sudoku, but remember to apply it to the diagonal ‘X’ regions as well.
  • See the diagonal rather than simply the rows, columns, and boxes on a regular basis. This is the main distinction between sudoku X and ordinary Sudoku.
  • Consider the top-left-to-bottom-right diagonal of the sample puzzle. Where can the three go in this area? Examine the opposite diagonal: where may the 8 go in that region? In all circumstances, you should be able to rapidly limit it to three locations.
  • Remember to utilize pencil marks or small numbers on our player tool to keep track of what may and cannot go where. To switch between big and tiny numbers, use the space bar on your keyboard.
  • The central square is the most powerful in the puzzle since it appears in five separate places: row 5, column 5, the middlebox, and both diagonal sections. As a result, as you place this square, keep in mind how much of the rest of the grid it views. Take a look at the image below, where the number four has been positioned in the center of the grid. This knowledge can be utilized to quickly place the 4 in the top-left box, which allows us to quickly place the 4 in the top-right box; can you see how?
  • Sudoku with an Xtra twist. Accepted Extra or Xtra challenge! Sudoku X adds a new twist to the classic Sudoku game.

Sudoku with an Xtra twist

Tactics with the basic sudoku X

Sudoku X shares most of its tactics with the basic Sudoku puzzle; thus, reading the section on sudoku strategy for the main raft of suggestions and ideas on solving sudoku X is highly recommended.

  • The cells in each side of the ‘X’ form must only contain the numbers 1 – 6 or 1 – 9 once.

As a result, keep this in mind as it will be critical to completing all but the most basic Sudoku.

  • The basic strategy for sudoku X is to play a lot of them to get used to this fact. If you started with normal Sudoku, as most people do, you ‘teach’ yourself to consider the vertical, horizontal, and 3 x 2 or 3 x 3 boxes. Still, you frequently neglect to consider the diagonal.
  • By considering the diagonal and having four considerations with each cell that you check, you can easily employ all of the usual sudoku tactics to solve sudoku X puzzles.
  • To summarize, while it may seem obvious, it is critical to remember the extra regions in order to solve Sudoku X. The most common issue people have with this puzzle is simply forgetting the ‘X,’ then being frustrated because they believe they must guess their way to a solution or find several solutions: but remember the X regions are there, and that problem immediately disappears!

Tactics with the basic sudoku X

Play Online for free

Additional limitations on the solution of Sudoku X

  • The two diagonals with nine cells that share the grid’s center cell must likewise be filled with numbers ranging from 1 to 9 in Sudoku X.
  • This knowledge allows the Sudoku X solver to narrow down the choices on those lines and make general deductions that would be impossible in traditional Sudoku.
  • On the other hand, these new limits allow the problem compiler to reduce the number of clues required, resulting in a balanced puzzle with variation and difficulty similar to classic Sudoku.
  • The solver must be prepared to use the extra diagonals to answer harder and more challenging problems. This pattern is proportional to the task’s difficulty.

Common Issues during Solving Sudoku -x

Some of the basic issues that can occur are explained and how they might be solved to the diagonals are also below:

  • Reduction in the number of lines and boxes

On numbers 1, 3, and 4, there is a sequence of related Box/Line deletions. The cells that include 1 as a candidate or solution have been highlighted, and you can see that the 1s for diagonal 1 can only be seen in frame 1 of the picture (from top left to bottom right). So, either A1 or B2 must be A 1; neither A1 nor B2 can be A 1.

Diagonal 2 causes a drop in square 5, marked in green (top right to bottom left). Since the 3 can only be found in frame 5, the 3 in D4 and F6 can be removed.

Frame 1 is the last reduction, with Diagonal 1 running for 4. Removing the remaining fours from frame 1, we have a twofold solution for A2.

Reduction in the number of lines and boxes

  • Sudoku X-Specific Pointing Pairs

In Sudoku X, there is another way to get out because the diagonals connect to the board at an angle that isn’t straight across. They make up the opposite sides of a rectangle because they don’t share a row or column. The diagonal can’t have the same number in each corner.

Sudoku X-Specific Pointing Pairs

  • Drawbacks of Distinctive Rectangles

D6 and J1 in Candidate Number 1 should be on your list of things to look at; D6 or J1 must both be 1.

It can be used with any single rectangle, but this one has a problem. None of the four cells must be in the middle of a diagonal.

The “deadly pattern” can not be done. In math, the “death pattern” is when you can move two integers together, but we can use deletions to prevent one from happening. Here’s how it works: however, if the corner of a pattern is diagonal, the pairings cannot be changed because doing so would break the diagonal rule.

Until all the cells are apart, there aren’t any rectangles that we can use. This example has seven eliminations, all based on Rectangle Type 2 logic, so this is a great example.

Drawbacks of Distinctive Rectangles

Play Online for free


We hope you’ve enjoyed this article. Sudoku is a fun and challenging puzzle game that can be a great way to pass the time. If you’re looking for more puzzles to keep you entertained, be sure to check out our other articles on the topic.

Also, Learn

A Magical Miracle Sudoku

Sudoku Latin Square

How to Play Sudoku Chute

Jigsaw Sudoku

Chess Sudoku

Diagonal Sudoku

Sandwich Sudoku

Arrow Sudoku Puzzle

Kropki Sudoku 

Mini Sudoku