Challenge Yourself With Hidden Triples Sudoku (The Ultimate Guide)

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Hidden Triples sudoku, also known as Hidden Girdles or Hidden Quadruples, is considered by many to be the most difficult type of sudoku on the market, and rightly so.

While other types of sudoku are almost as challenging as Hidden Triples sudoku, none come close to rivaling its level of difficulty.

So in this article, we’ll talk about what makes Hidden Triples sudoku such a challenge and give you some tips on how to solve it once you have it in front of you.

Whether you’re an avid sudoku player or have never played before, hidden triples sudoku can provide an entirely new experience and test your skills in ways you might not be used to.

It’s harder than the traditional sudoku that many people are used to, but the increased difficulty can also make it more satisfying when you complete a puzzle.

In this ultimate guide to hidden triples sudoku, you’ll learn all about what they are, how to solve them, and what makes them different from regular sudoku puzzles.

What are Hidden Triples Sudoku?

Hidden Triples Sudoku puzzles are Sudoku puzzles that contain three sets of triplets – a total of nine cells.

The cells in each set of triplets are connected horizontally, vertically, or diagonally.

Hidden Triples Sudoku
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Hidden Triples Sudoku puzzles are a variation of the popular Sudoku puzzle.

The object of the Hidden Triples Sudoku puzzle is to find all of the triplets in the grid.

A triplet is a set of three numbers that are consecutive and share a common sum.

The Hidden Triples Sudoku puzzle can be solved using the same strategies as the regular Sudoku puzzle.

The only difference is that you need to look for triplets instead of single numbers.

One way to think about it is as a puzzle within a puzzle.

The challenge here is that in each row, column and square, there will be a three-digit number (each with digits 1 through 9).

Each hidden triple must have all digits from a single set of three numbers; for example, 212 may only be used once in any given hidden triple.

In addition, there may not be two instances of the same number in any given hidden triple.

Hidden Triples Sudoku Rules

The rules change slightly depending on whether you’re playing in easy, medium, or hard mode, so it’s important to know which ones apply to your game to make them easier to solve.

The rules for Hidden Triples sudoku are exactly like classic sudoku except for these two extra stipulations:

  1. You can only fill in a cell if it’s empty or contains a number from your puzzle’s particular set of triplets. These new rules add just enough extra challenge to make things interesting without complicating things too much on lower levels.
  2. The 2nd rule is that every number can only appear once in each row, column, and block.
  3. The third rule is a little more complicated, but it’s worth learning. This rule is called the hidden triple rule. A hidden triple is a group of three numbers that all appear in the same row, column, or block. The sum of these three numbers must also be the same
  4. The numbers in these squares don’t have to be consecutive, and they don’t have to be in order.
  5. Hidden Triples are a special case of X-Wing puzzles. In an X-Wing, two squares in a row or column are each assigned the same number. The numbers in these squares must be consecutive, and they must be in order.

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Tips and Tricks for Hidden Triples Sudoku (HTS)

The Tips and Tricks of Hidden Triples sudoku are very similar to standard sudoku: there is a 9×9 grid with some blank spaces and numbers that must be filled in.

The difference is that, in hidden triples sudoku, there are additional numbers on certain lines and columns which can’t be used more than once.

They represent single-digit patterns, such as 111 or 222.

You need to find them using logic and trial-and-error—essentially combining logic puzzles and math problems. This can make it quite tricky!

Tips and Tricks for Hidden triples sudoku
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The most important thing to remember when looking for hidden triples is that the numbers must be consecutive.

For example, if you have the number 5 in one square, it can’t also be in the squares next to it. However, the number 5 can be in squares that are diagonal from each other.

How To Play Hidden Triples Sudoku

To solve Hidden Triples sudoku puzzles, you need some additional help from a guide.

This guide will give you an overall look at how Hidden Triples sudoku puzzles work so that when you do encounter one, you’ll know how it works and be able to solve it.

In a Hidden Triples sudoku puzzle, there are 27 cells in each row, column, and box and nine numbers per space.

The nine numbers that appear in every Hidden Triples sudoku puzzle are 1, 2, 3, 4, 5, and 6 as well as their three-number neighbors: 7, 8, and 9.

There is also one hidden triplet, which consists of three numbers in a single cell that adds up to 15.

The First goal of Hidden Triples Sudoku is to find all of the sets of three numbers that share a common factor.

The easiest way to find the sets of three numbers is to start by looking at the numbers in the rows and columns.

If you see a number that appears twice, there is a good chance that it is part of a set of three numbers. You can also look for patterns in the grid.

How To Play Hidden Triples Sudoku
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The object of the game HTS is to fill in the missing numbers in the grid so that each row of Puzzle, a column of Game, and 3 of 3 squares contains the numbers 1 through 9 exactly once.

On any given puzzle, there will be 9 hidden triples: 3 on each side and 3 down each side.

For example, if we look at a puzzle with 369 in it (as you can see above), those numbers are part of one hidden triple on top and 248 on left.

To play Hidden Triples sudoku effectively, you have to find as many as possible while trying not to disturb any that are already there… or even see them!

Advanced Techniques For Solving Hidden Quadruple Sudoku

There are a few different advanced techniques that can be used when solving hidden quadruple Sudoku puzzles.

  1. The first is to use the process of elimination. This can be done by identifying and crossing out numbers in the grid that can’t possibly be part of the solution. For example, if there is a 3 in a row and a 5 in a column, then the 5 can be crossed out because it can’t fit in the row.
  2. Another advanced technique is to use what is called the “box method”. This involves marking off all of the squares in the grid that contain Triples.
  3. The 3rd is to look for patterns. Many of the squares in the puzzle will be filled in, which can help to narrow down the possibilities.
  4. Another technique is to use a grid to help organize the information. This can be helpful in particularly difficult puzzles.
  5. Finally, it can be helpful to use a computer program to help with the puzzle-solving process.

Good Moves in Hidden Triples Sudoku

The basic principle of Hidden Triples Sudoku is to find the three sets of triples in the grid and mark them with an X.

Once you have found the triples, the next step is to determine which numbers are in each triple.

This can be done by looking at the numbers in the rows and columns that intersect with the triple

In Hidden Triples Sudoku, some of the digits are already given and you must find the other two that complete a triple.

The Good Moves in Hidden Triples Sudoku are the moves that will get you from one triple to another as quickly as possible. There are several different strategies you can use to do the same.

Common Mistakes

There are a few common mistakes that people make when playing Hidden Triple Sudoku.

  1. The most common mistake is trying to complete the puzzle by guessing. This is not only ineffective but can also be frustrating.
  2. Another common mistake is filling in the wrong numbers in the wrong places. This can lead to confusion and can cause you to lose track of where you are in the puzzle.
  3. A third common mistake is not checking your work as you go. This can lead to mistakes further down the line that is difficult to correct.
  4. The Next mistake is not checking the grid for errors. Sometimes people will mistakenly enter a number in a cell when it should have been entered in a neighboring cell.
  5. The last mistake is not using pencil marks to help track progress. This can lead to mistakes being made when filling in the grid later on.

Differences from the normal game

Hidden Triples sudoku is sudoku with some major changes.

  1. The main change is that Hidden Triples sudoku has hidden triples.
  2. Another change is that each column, row, and region can have only one digit 1 (there can be no repeated 1s in a region), a constraint that does not apply to normal sudoku.
  3. Also, there are exactly six regions in hidden triples sudoku: three regions on each side of the board; in other words, an additional row and column beyond those in regular sudoku.

There are two main differences between Hidden Triples Sudoku and the normal game.

  1. The first difference is that in Hidden Triples Sudoku, the numbers in each row, column, and 3×3 box must add up to the same number.
  2. The 2nd and most obvious difference is that in Hidden Triple Sudoku, there are three Sudoku puzzles overlapping one another.
  3. The 3rd difference is that the numbers in each 3×3 grid in the Hidden Triple Sudoku puzzles are all different.
  4. Finally, the digits in the overlapping Sudoku puzzles must also be different.


This blog post deals with a hidden triplet in a Sudoku puzzle.

If you are unfamiliar with Sudoku, it is a logic-based number-placement puzzle.

This post provides a step-by-step guide on how to find the hidden triplet.

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This article has discussed how to solve a Hidden Triple Sudoku puzzle.

These puzzles are a bit more difficult than traditional Sudoku puzzles, but they are a lot of fun.

To follow along with future Sudoku-related articles, follow our website.

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