Sudoku
Academy
it is not that I’m so smart. But I stay with the questions much longer
Albert Einstein
Welcome to the Hard Level Techniques at Sudoku X Academy. This section is tailored for those who have successfully navigated through our medium level and are ready to tackle the more demanding challenges of advanced Sudoku.
hard level techniques
Table of Contents
Last
free cell
The very first step you can take is to search for obvious naked singles. Why? Because they’re the low-hanging fruit, as it’s often described. You shouldn’t make Sudoku harder for yourself when there’s an easier way.
This fundamental Sudoku technique involves identifying numbers for which it’s immediately apparent that there’s no other option. That’s why they’re called “Obvious” or “Naked Singles.”
If you observe the highlighted cell, you’ll see the number 7 noted in the so-called notes. In this instance, this is the only cell with just one number, which indicates that the number 7 is the sole solution here. Erase the note and input the number 7 into the cell, and you’ve successfully tackled an Obvious or Naked Single.
By the way, you can apply this technique multiple times throughout the game. As you progress in the game, obvious or naked singles will reveal themselves more frequently.
We believe it’s wise to always start by searching for Obvious or Naked Singles first since you won’t need to pay attention to them afterward. Moreover, it aids you in making decisions later in the rest of the game.
Note: It’s essential to be patient when using this technique. Sometimes, the obvious or naked single might not immediately stand out, especially when the board is densely populated with numbers. Practicing regularly helps enhance your ability to spot these singles quickly, speeding up your game significantly.
Last
possible number
The very first step you can take is to search for obvious naked singles. Why? Because they’re the low-hanging fruit, as it’s often described. You shouldn’t make Sudoku harder for yourself when there’s an easier way.
This fundamental Sudoku technique involves identifying numbers for which it’s immediately apparent that there’s no other option. That’s why they’re called “Obvious” or “Naked Singles.”
If you observe the highlighted cell, you’ll see the number 7 noted in the so-called notes. In this instance, this is the only cell with just one number, which indicates that the number 7 is the sole solution here. Erase the note and input the number 7 into the cell, and you’ve successfully tackled an Obvious or Naked Single.
By the way, you can apply this technique multiple times throughout the game. As you progress in the game, obvious or naked singles will reveal themselves more frequently.
We believe it’s wise to always start by searching for Obvious or Naked Singles first since you won’t need to pay attention to them afterward. Moreover, it aids you in making decisions later in the rest of the game.
Note: It’s essential to be patient when using this technique. Sometimes, the obvious or naked single might not immediately stand out, especially when the board is densely populated with numbers. Practicing regularly helps enhance your ability to spot these singles quickly, speeding up your game significantly.
Last
possible position
The very first step you can take is to search for obvious naked singles. Why? Because they’re the low-hanging fruit, as it’s often described. You shouldn’t make Sudoku harder for yourself when there’s an easier way.
This fundamental Sudoku technique involves identifying numbers for which it’s immediately apparent that there’s no other option. That’s why they’re called “Obvious” or “Naked Singles.”
If you observe the highlighted cell, you’ll see the number 7 noted in the so-called notes. In this instance, this is the only cell with just one number, which indicates that the number 7 is the sole solution here. Erase the note and input the number 7 into the cell, and you’ve successfully tackled an Obvious or Naked Single.
By the way, you can apply this technique multiple times throughout the game. As you progress in the game, obvious or naked singles will reveal themselves more frequently.
We believe it’s wise to always start by searching for Obvious or Naked Singles first since you won’t need to pay attention to them afterward. Moreover, it aids you in making decisions later in the rest of the game.
Note: It’s essential to be patient when using this technique. Sometimes, the obvious or naked single might not immediately stand out, especially when the board is densely populated with numbers. Practicing regularly helps enhance your ability to spot these singles quickly, speeding up your game significantly.