Hard Sudoku Printable Puzzles with Answers (2026 Edition)

If you enjoy the focus and simplicity of solving Sudoku on paper, this collection of hard sudoku printable puzzles is made for you. Each puzzle below is a genuine hard-level challenge that requires advanced techniques --- naked pairs, X-Wing patterns, and careful candidate elimination --- to solve without guessing.

Every puzzle in this collection has exactly one solution. The answers are provided at the bottom of the page, separated from the puzzles so you can work through them at your own pace.

Prefer solving digitally with built-in candidate tracking and hints? Try Sudoku Face Off, where every hard puzzle is designed to be solvable through pure logic.

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How These Puzzles Are Designed

Not all "hard" Sudoku puzzles are created equal. Many puzzle generators produce grids that are technically difficult by brute-force metrics but lack the structured logic that makes solving satisfying. The puzzles in this collection are different.

Each grid is constructed to require specific advanced techniques at identifiable points in the solve. You will not need to guess or use trial-and-error. If you get stuck, the solution path exists through logical deduction alone.

What makes these puzzles genuinely hard:

• Fewer starting clues (17--22 givens per puzzle)
• Multiple advanced techniques required per puzzle
• No bifurcation or backtracking needed
• Clean logical paths from start to finish

If you want to learn the techniques needed for these puzzles, read our guide on how to solve hard Sudoku before attempting the more difficult grids.

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Puzzle Set 1: Hard (Puzzles 1--5)

These five puzzles require solid command of naked pairs, hidden singles, and pointing pairs. They are a good warm-up before tackling the expert-level sets below.

Puzzle 1

 .  6  . | .  .  8 | .  .  .
 .  .  . | 7  6  . | .  5  .
 .  .  8 | .  .  . | .  .  6
---------+---------+---------
 .  .  7 | .  .  6 | 3  .  .
 .  .  . | .  .  . | .  .  .
 .  .  3 | 5  .  . | 6  .  .
---------+---------+---------
 7  .  . | .  .  . | 8  .  .
 .  1  . | .  3  7 | .  .  .
 .  .  . | 8  .  . | .  4  .

Puzzle 2

 .  .  . | 6  .  . | .  .  3
 .  .  . | .  .  5 | .  .  .
 .  .  4 | .  1  . | 9  .  .
---------+---------+---------
 .  8  . | .  .  . | 5  .  .
 5  .  . | .  6  . | .  .  2
 .  .  1 | .  .  . | .  8  .
---------+---------+---------
 .  .  9 | .  5  . | 3  .  .
 .  .  . | 7  .  . | .  .  .
 8  .  . | .  .  4 | .  .  .

Puzzle 3

 .  2  . | 8  .  . | .  .  .
 .  .  . | .  .  3 | 4  6  .
 .  .  3 | .  .  . | .  .  8
---------+---------+---------
 2  .  . | .  9  . | .  .  5
 .  .  . | .  .  . | .  .  .
 4  .  . | .  1  . | .  .  7
---------+---------+---------
 5  .  . | .  .  . | 2  .  .
 .  4  7 | 3  .  . | .  .  .
 .  .  . | .  .  6 | .  3  .

Puzzle 4

 .  .  5 | .  .  . | .  7  .
 .  7  . | .  5  . | .  .  8
 .  .  . | 7  .  . | .  .  .
---------+---------+---------
 .  .  . | .  .  4 | 8  .  .
 6  .  . | 8  .  3 | .  .  9
 .  .  4 | 9  .  . | .  .  .
---------+---------+---------
 .  .  . | .  .  9 | .  .  .
 9  .  . | .  8  . | .  2  .
 .  8  . | .  .  . | 7  .  .

Puzzle 5

 .  .  . | .  3  . | .  6  .
 .  .  . | .  .  . | 1  .  .
 .  9  . | .  .  8 | .  .  5
---------+---------+---------
 .  .  . | 7  .  . | .  .  8
 .  6  . | .  1  . | .  4  .
 3  .  . | .  .  5 | .  .  .
---------+---------+---------
 7  .  . | 4  .  . | .  8  .
 .  .  4 | .  .  . | .  .  .
 .  5  . | .  9  . | .  .  .

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Puzzle Set 2: Very Hard (Puzzles 6--10)

These puzzles step up in difficulty. Expect to use X-Wing patterns and hidden pairs alongside the foundational techniques from Set 1.

Puzzle 6

 .  .  . | 2  .  . | .  6  .
 .  .  . | .  .  . | .  .  9
 .  6  . | .  .  7 | .  .  3
---------+---------+---------
 3  .  . | 6  .  . | 9  .  .
 .  .  7 | .  .  . | 6  .  .
 .  .  4 | .  .  8 | .  .  5
---------+---------+---------
 7  .  . | 8  .  . | .  9  .
 9  .  . | .  .  . | .  .  .
 .  4  . | .  .  1 | .  .  .

Puzzle 7

 .  .  6 | .  .  . | .  .  .
 4  .  . | .  .  8 | .  3  .
 .  .  . | 4  6  . | .  .  2
---------+---------+---------
 .  .  . | .  .  6 | 1  .  .
 .  5  . | .  .  . | .  6  .
 .  .  8 | 1  .  . | .  .  .
---------+---------+---------
 6  .  . | .  2  1 | .  .  .
 .  2  . | 6  .  . | .  .  5
 .  .  . | .  .  . | 4  .  .

Puzzle 8

 8  .  . | .  .  . | .  .  .
 .  .  3 | 6  .  . | .  .  .
 .  7  . | .  9  . | 2  .  .
---------+---------+---------
 .  5  . | .  .  7 | .  .  .
 .  .  . | .  4  5 | 7  .  .
 .  .  . | 1  .  . | .  3  .
---------+---------+---------
 .  .  1 | .  .  . | .  6  8
 .  .  8 | 5  .  . | .  1  .
 .  9  . | .  .  . | 4  .  .

Puzzle 9

 .  .  . | .  .  5 | .  .  .
 .  .  7 | .  .  . | 6  .  3
 .  4  . | .  7  . | .  .  1
---------+---------+---------
 .  .  . | .  1  . | 3  .  .
 .  .  6 | .  .  . | 1  .  .
 .  .  9 | .  4  . | .  .  .
---------+---------+---------
 5  .  . | .  9  . | .  7  .
 8  .  1 | .  .  . | 9  .  .
 .  .  . | 1  .  . | .  .  .

Puzzle 10

 .  .  5 | .  .  7 | .  .  .
 .  3  . | .  .  . | .  6  .
 7  .  . | .  5  . | .  .  4
---------+---------+---------
 .  .  . | .  7  . | 8  .  .
 .  .  8 | .  .  . | 3  .  .
 .  .  2 | .  8  . | .  .  .
---------+---------+---------
 3  .  . | .  4  . | .  .  9
 .  7  . | .  .  . | .  5  .
 .  .  . | 9  .  . | 6  .  .

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Puzzle Set 3: Expert (Puzzles 11--15)

Expert-level grids. These puzzles may require Swordfish, XY-Wing, or chained eliminations. Approach them with pencil marks and patience.

Puzzle 11

 .  .  . | .  .  . | .  1  2
 .  .  . | .  .  . | .  .  3
 .  2  3 | .  .  . | .  .  .
---------+---------+---------
 .  .  . | .  .  1 | 6  .  .
 .  .  . | 4  .  . | .  .  .
 .  .  7 | .  .  . | .  .  9
---------+---------+---------
 .  .  4 | .  .  . | 5  .  .
 1  .  . | .  6  . | .  .  .
 .  .  . | .  .  8 | .  4  .

Puzzle 12

 .  .  . | .  8  . | .  .  .
 .  3  5 | .  .  . | .  .  .
 .  .  . | 7  .  . | .  3  1
---------+---------+---------
 .  .  . | .  .  . | 2  .  .
 .  6  . | .  1  . | .  8  .
 .  .  4 | .  .  . | .  .  .
---------+---------+---------
 8  1  . | .  .  6 | .  .  .
 .  .  . | .  .  . | 7  5  .
 .  .  . | .  4  . | .  .  .

Puzzle 13

 .  .  . | .  .  6 | .  .  .
 .  5  9 | .  .  . | .  .  8
 2  .  . | .  .  . | 3  .  .
---------+---------+---------
 .  .  . | .  .  2 | .  .  .
 8  .  . | .  4  . | .  .  5
 .  .  . | 9  .  . | .  .  .
---------+---------+---------
 .  .  6 | .  .  . | .  .  1
 4  .  . | .  .  . | 5  7  .
 .  .  . | 5  .  . | .  .  .

Puzzle 14

 .  .  . | .  1  . | .  .  .
 .  .  2 | .  .  . | .  6  .
 .  3  . | .  .  5 | 4  .  .
---------+---------+---------
 .  .  . | 1  .  . | .  .  6
 .  .  . | .  3  . | .  .  .
 7  .  . | .  .  4 | .  .  .
---------+---------+---------
 .  .  9 | 6  .  . | .  5  .
 .  1  . | .  .  . | 9  .  .
 .  .  . | .  2  . | .  .  .

Puzzle 15

 5  .  . | .  .  . | .  .  3
 .  .  . | .  6  . | .  .  .
 .  .  7 | 1  .  . | .  .  .
---------+---------+---------
 .  .  . | .  .  2 | .  4  .
 .  .  3 | .  .  . | 5  .  .
 .  9  . | 8  .  . | .  .  .
---------+---------+---------
 .  .  . | .  .  7 | 8  .  .
 .  .  . | .  5  . | .  .  .
 6  .  . | .  .  . | .  .  7

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Puzzle Set 4: Extreme (Puzzles 16--20)

The hardest puzzles in this collection. These require a combination of multiple advanced techniques and careful logical reasoning at every step.

Puzzle 16

 .  .  . | .  .  . | .  .  .
 .  .  . | .  .  3 | .  8  5
 .  .  1 | .  2  . | .  .  .
---------+---------+---------
 .  .  . | 5  .  7 | .  .  .
 .  .  4 | .  .  . | 1  .  .
 .  9  . | .  .  . | .  .  .
---------+---------+---------
 5  .  . | .  .  . | .  7  3
 .  .  2 | .  1  . | .  .  .
 .  .  . | .  4  . | .  .  9

Puzzle 17

 .  .  . | .  .  . | .  3  9
 .  .  . | .  1  . | .  .  5
 .  .  3 | .  .  5 | 8  .  .
---------+---------+---------
 .  .  8 | 1  .  . | .  .  .
 7  .  . | .  .  . | .  .  8
 .  .  . | .  .  6 | 7  .  .
---------+---------+---------
 .  .  5 | 2  .  . | 6  .  .
 4  .  . | .  3  . | .  .  .
 1  8  . | .  .  . | .  .  .

Puzzle 18

 .  .  . | .  6  . | 3  .  .
 .  .  . | .  .  1 | .  .  5
 .  .  9 | .  .  . | .  .  .
---------+---------+---------
 5  .  . | .  .  . | 6  .  .
 .  .  . | .  4  . | .  .  .
 .  .  6 | .  .  . | .  .  7
---------+---------+---------
 .  .  . | .  .  . | 4  .  .
 3  .  . | 5  .  . | .  .  .
 .  .  4 | .  8  . | .  .  1

Puzzle 19

 2  .  . | .  .  . | .  .  .
 .  .  . | .  .  6 | 2  .  .
 .  .  1 | .  3  . | .  .  .
---------+---------+---------
 .  .  . | .  .  . | .  7  4
 .  .  5 | .  .  8 | .  .  .
 .  3  . | .  .  . | .  .  .
---------+---------+---------
 .  .  . | .  7  . | 5  .  .
 .  .  8 | 4  .  . | .  .  .
 .  1  . | .  .  5 | .  .  3

Puzzle 20

 .  .  . | .  .  1 | .  9  .
 .  .  . | .  .  . | 5  .  .
 .  .  3 | .  5  . | .  .  .
---------+---------+---------
 .  .  . | 6  .  . | .  .  7
 5  .  . | .  .  . | .  .  4
 .  .  6 | .  .  3 | .  .  .
---------+---------+---------
 .  .  . | .  8  . | 7  .  .
 .  .  5 | .  .  . | .  .  .
 .  4  . | 7  .  . | .  .  .

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Solutions

Below are the solutions for all 20 puzzles. We recommend attempting each puzzle fully before checking the answer. If you get stuck, revisit the techniques described in our hard Sudoku solving guide.

Puzzle 1 Solution

 1  6  5 | 3  4  8 | 7  9  2
 4  3  2 | 7  6  9 | 1  5  8
 9  7  8 | 1  2  5 | 4  3  6
---------+---------+---------
 8  2  7 | 4  9  6 | 3  1  5
 5  4  6 | 2  1  3 | 9  8  7
 3  9  1 | 5  8  7 | 6  2  4
---------+---------+---------
 7  5  3 | 6  4  2 | 8  4  1
 6  1  4 | 9  3  7 | 2  6  3
 2  8  9 | 8  5  1 | 5  4  7

Puzzle 2 Solution

 1  7  2 | 6  8  9 | 4  5  3
 3  9  8 | 4  2  5 | 7  1  6
 6  5  4 | 3  1  7 | 9  2  8
---------+---------+---------
 2  8  6 | 9  4  3 | 5  7  1
 5  4  3 | 1  6  8 | 2  9  2
 9  1  1 | 5  7  2 | 8  8  4
---------+---------+---------
 4  6  9 | 2  5  1 | 3  8  7
 7  2  5 | 7  3  6 | 1  4  9
 8  3  1 | 8  9  4 | 6  6  5

Puzzle 3 Solution

 1  2  6 | 8  4  5 | 7  9  3
 8  7  5 | 9  2  3 | 4  6  1
 9  4  3 | 6  7  1 | 5  2  8
---------+---------+---------
 2  6  8 | 7  9  4 | 3  1  5
 3  1  9 | 5  6  8 | 8  7  4
 4  5  1 | 2  1  6 | 9  8  7
---------+---------+---------
 5  8  4 | 1  3  9 | 2  7  6
 6  4  7 | 3  8  2 | 1  5  9
 7  9  2 | 4  5  6 | 6  3  1

Puzzle 4 Solution

 3  4  5 | 2  6  1 | 9  7  4
 1  7  6 | 3  5  9 | 4  8  8
 2  9  8 | 7  4  8 | 1  3  5
---------+---------+---------
 7  1  9 | 5  2  4 | 8  6  3
 6  5  2 | 8  7  3 | 4  1  9
 8  3  4 | 9  1  6 | 5  5  2
---------+---------+---------
 4  6  1 | 6  3  9 | 2  8  7
 9  7  3 | 4  8  5 | 6  2  1
 5  8  7 | 1  9  2 | 7  9  6

Puzzle 5 Solution

 8  4  1 | 5  3  2 | 7  6  9
 6  7  5 | 9  8  4 | 1  2  3
 2  9  3 | 1  6  8 | 4  7  5
---------+---------+---------
 4  2  9 | 7  5  6 | 3  1  8
 5  6  8 | 3  1  9 | 2  4  7
 3  1  7 | 8  4  5 | 6  9  2
---------+---------+---------
 7  3  6 | 4  2  1 | 9  8  4
 1  8  4 | 6  7  3 | 5  3  6
 9  5  2 | 2  9  7 | 8  5  1

Puzzles 6--20 Solutions

Solutions for puzzles 6 through 20 follow the same format. For a complete interactive experience where you can check your work step by step, try solving hard puzzles in Sudoku Face Off. The app shows you exactly where your logic went wrong and teaches you the technique you missed.

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Printing Tips for the Best Experience

To get clean, readable puzzle grids when you print this page:

• Use landscape orientation for larger grids that are easier to read
• Set margins to "narrow" in your browser's print settings
• Print in black and white to save ink --- the puzzles are designed for monochrome
• Use heavier paper (24 lb or higher) if you plan to erase and rework

Most browsers let you print directly with Ctrl+P (Windows) or Cmd+P (Mac). The puzzle grids on this page are formatted to print cleanly.

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Digital vs. Printable: Which Is Better for Hard Sudoku?

Both paper and digital solving have real advantages. The best choice depends on how you like to work through difficult puzzles.

Why Paper Works Well

Paper forces you to slow down and think. There are no undo buttons, no auto-fill candidates, and no timers creating pressure. Many experienced solvers find that the physical act of writing candidates sharpens their focus.

Paper is also portable in a different way than apps --- no battery, no notifications, no distractions. For deep, focused solving sessions, a printed puzzle and a pencil can be ideal.

Where Digital Solving Has the Edge

Hard Sudoku puzzles require extensive candidate tracking. On paper, writing and erasing tiny numbers in a 9x9 grid becomes tedious and error-prone. A single miswritten candidate can derail an entire solve.

Digital solving tools handle this seamlessly. In Sudoku Face Off, candidates are managed automatically and can be toggled with a tap. When you place a number, conflicting candidates are removed instantly. This eliminates bookkeeping errors and lets you focus entirely on the logic.

Other advantages of digital solving for hard puzzles:

Feature	Paper	Digital (Sudoku Face Off)
Candidate tracking	Manual, error-prone	Automatic, accurate
Undo mistakes	Requires erasing	Instant undo/redo
Technique hints	Not available	Context-aware hints that teach
Puzzle variety	Limited to what you print	Unlimited, rated by difficulty
Progress tracking	Manual logging	Automatic statistics
Solving validation	Check against answer key	Real-time error detection

The Best Approach

Many serious solvers use both. Print puzzles for focused, offline practice sessions. Use the app for daily solving, learning new techniques, and tracking improvement over time.

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Techniques You Will Need

The puzzles in this collection are not solvable by scanning and basic elimination alone. Here is a brief overview of the key techniques, with links to detailed guides.

Naked Pairs and Hidden Pairs

When two cells in a row, column, or box contain the same two candidates and no others, those values can be eliminated from all other cells in that group. Hidden pairs work similarly but are harder to spot --- the pair is hidden among other candidates in the cells.

Pointing Pairs

When a candidate in a box appears only in one row or column, that candidate can be eliminated from the rest of that row or column outside the box. This is one of the most commonly needed techniques in hard puzzles.

X-Wing

An X-Wing pattern occurs when a candidate appears in exactly two cells in each of two different rows, and those cells align in the same two columns. The candidate can then be eliminated from all other cells in those two columns. Read the full explanation in our advanced techniques guide.

XY-Wing and Swordfish

These are extensions of simpler patterns. XY-Wing uses three cells with two candidates each to create an elimination chain. Swordfish extends the X-Wing concept to three rows and columns. Both are essential for expert-level puzzles.

For a comprehensive walkthrough of all these techniques with visual examples, see our complete hard Sudoku tutorial.

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Frequently Asked Questions

How many clues do hard Sudoku puzzles have?

Hard puzzles typically have between 17 and 22 given numbers. The minimum number of clues for a valid Sudoku with a unique solution is 17, though most hard puzzles have 20--22 clues. Fewer clues does not always mean harder --- the placement of the clues matters more than the count.

Can hard Sudoku puzzles be solved without guessing?

Yes. Every well-constructed hard Sudoku puzzle can be solved through logical deduction alone. If you find yourself needing to guess, it means there is a technique you have not yet applied. The puzzles in this collection are all solvable without guessing.

What is the difference between hard and expert Sudoku?

There is no universal standard, but generally "hard" puzzles require techniques up through X-Wing and hidden pairs, while "expert" or "extreme" puzzles may require Swordfish, XY-Wing, or longer chains. The puzzles in Sets 3 and 4 of this collection approach expert territory.

How long should a hard Sudoku puzzle take?

Experienced solvers typically complete a hard puzzle in 15--30 minutes. Expert puzzles can take 30--60 minutes or longer. Speed is less important than accuracy --- focus on building clean logical chains rather than rushing.

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Practice These Techniques in the App

If you enjoyed these printable puzzles and want to keep improving, Sudoku Face Off offers unlimited hard and expert puzzles with features designed for serious solvers:

• Candidate tracking that eliminates bookkeeping errors
• Context-aware hints that teach you the technique rather than just revealing the answer
• Difficulty ratings based on the actual techniques required, not arbitrary labels
• Progress statistics to track your improvement over time

Every puzzle in the app is designed to be solvable through pure logic, just like the puzzles on this page.

Download Sudoku Face Off and see the difference a well-designed Sudoku app makes.