Sudoku Quiz

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Welcome to the Ultimate Sudoku Quiz!

Are you ready to challenge your logical thinking and number-crunching skills?

Dive into our Free Online Sudoku Quiz and put your problem-solving abilities to the test. This interactive quiz is perfect for Sudoku enthusiasts of all levels—from beginners looking to sharpen their skills to seasoned solvers seeking a new challenge.

Uncover fascinating facts about the history of Sudoku, learn advanced solving techniques, and receive personalized tips to improve your game. It’s engaging, informative, and best of all, it’s free!

Why wait? Embark on your Sudoku journey today and become a true puzzle-solving master!

Disclaimer: The hard questions in the Sudoku Quiz are challenging. To finish the game and reaching the master level typically requires a significant amount of grit, determination and perseverance. I you want to learn more about sudoku check out our article about Sudoku as a passion.

Question 1:

What is the standard grid size for a classic Sudoku puzzle?

Click to see Hint ⬇
The grid is a square and has 81 cells.
Click to see Answer ⬇
9x9 - A classic Sudoku puzzle consists of a 9x9 grid divided into nine 3x3 subgrids.

Question 2:

In Sudoku, what is the objective of the game?

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The numbers must follow specific rules within the grid.
Click to see Answer ⬇
To fill the grid with numbers from 1 to 9 - Sudoku is a number-placement puzzle where the objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid contain all of the digits from 1 to 9.

Question 3:

What is the maximum number of times a digit can appear in each row, column, and 3x3 subgrid in a Sudoku puzzle?

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The key to solving Sudoku is to avoid repeating digits within the same row, column, or 3x3 subgrid.
Click to see Answer ⬇
Once - The rules of Sudoku dictate that each digit can appear only once in each row, column, and 3x3 subgrid, ensuring a unique solution.

Question 4:

In Sudoku, what is the term for the initial numbers provided in the grid that cannot be changed?

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These numbers are already filled in at the beginning of the game.
Click to see Answer ⬇
Fixed numbers - Fixed numbers, also known as givens, are the initial numbers provided in a Sudoku grid that remain constant throughout the game and serve as starting points for solving the puzzle.

Question 5:

What is the term for a strategy in Sudoku that involves identifying where a particular number can be placed in a row, column, or 3x3 subgrid?

Click to see Hint ⬇
This strategy helps narrow down the possible locations for a number.
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Candidate list - The candidate list strategy involves creating a list of possible locations for a specific number within a row, column, or 3x3 subgrid based on the numbers already present in the puzzle.

Question 6:

What is the minimum number of givens required to create a unique solvable Sudoku puzzle?

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The minimum number of givens is less than 20.
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17 - Research has shown that 17 clues are the fewest number of givens needed to ensure a Sudoku puzzle has a unique solution.

Question 7:

What is the term for a Sudoku puzzle that has only one unique solution?

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The term implies correctness and uniqueness.
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Proper - A 'Proper' Sudoku puzzle is one that has a unique solution, making it solvable and satisfying the rules of the game.

Question 8:

What is the maximum number of times a digit can appear in a 2x2 subgrid in a Sudoku puzzle?

Click to see Hint ⬇
Consider the size of the subgrid.
Click to see Answer ⬇
1 - In a 2x2 subgrid, each digit from 1 to 4 can only appear once to adhere to the rules of Sudoku.

Question 9:

What is the term for a strategy in Sudoku that involves considering the implications of a particular number being placed in a cell?

Click to see Hint ⬇
This strategy involves hypothetical scenarios.
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What-If Analysis - In 'What-If Analysis', players consider the consequences of placing a specific number in a cell to deduce its validity.

Question 10:

What is the term for a Sudoku puzzle that cannot be solved without making guesses?

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The term implies an unjust disadvantage.
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Unfair - 'Unfair' Sudoku puzzles cannot be solved using logic alone and necessitate guesses or trial-and-error.

Question 11:

What is the term for a Sudoku puzzle that has a unique solution but cannot be solved using only the basic solving techniques?

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This term is often used to describe the most challenging Sudoku puzzles.
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Diabolical Sudoku - Diabolical Sudoku puzzles are the most difficult and require advanced solving strategies beyond the basic techniques.

Question 12:

What is the name of a Sudoku solving technique that involves finding a cell where only two numbers can fit and using this information to eliminate possibilities in other cells?

Click to see Hint ⬇
This technique involves identifying pairs of numbers in specific cells.
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Naked Pair - The Naked Pair technique is an advanced solving strategy in Sudoku that focuses on identifying cells with only two possible numbers, which can then be used to eliminate other possibilities in the same row, column, or 3x3 subgrid.

Question 13:

What is the term for a Sudoku puzzle that has multiple valid solutions?

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This term indicates that the puzzle has more than one valid solution.
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Non-unique Sudoku - Non-unique Sudoku puzzles have more than one valid solution, making them challenging to solve and distinct from standard puzzles with a unique solution.

Question 14:

What is the name of a Sudoku solving technique that involves identifying a group of three rows or columns where a particular number can only appear in three different cells?

Click to see Hint ⬇
This technique involves identifying a group of three rows or columns with a specific number.
Click to see Answer ⬇
Triplets - The Triplets technique is an advanced strategy in Sudoku that focuses on identifying sets of three rows or columns where a particular number can only appear in three different cells, allowing for the elimination of other possibilities in those cells.

Question 15:

What is the term for a Sudoku solving technique that involves identifying a group of four cells where a specific number can only appear in those cells within a 2x2 subgrid?

Click to see Hint ⬇
This technique involves identifying a group of four cells within a 2x2 subgrid with a specific number.
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Quads - The Quads technique is an advanced solving strategy in Sudoku that focuses on identifying sets of four cells within a 2x2 subgrid where a particular number can only appear in those cells, allowing for the elimination of other possibilities in those cells.

Question 16:

What type of puzzle is a 9x9 grid divided into nine 3x3 subgrids, with the objective of filling in the grid so that every row, column, and subgrid contains all the numbers from 1 to 9?

Click to see Hint ⬇
This puzzle game involves filling a 9x9 grid with numbers.
Click to see Answer ⬇
Sudoku - Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid contain all of the digits from 1 to 9.