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Unlimited free 16×16 Sudoku puzzles
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Classic Sudoku
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16×16 Sudoku
Play 16×16 Sudoku Online – Free 16×16 Hex Sudoku Puzzles
Play 16×16 Sudoku online for free – the largest Sudoku format available. Use numbers 1–16 (with A–G for 10–16) across rows, columns, and 4×4 boxes. Whether you're looking for easy, medium, hard, or expert 16×16 Sudoku puzzles, play instantly in your browser or download printable 16×16 Sudoku PDFs.
16×16 16×16 grid
256 256 cells
6 difficulty levels
Core experience
Play 16×16 Sudoku Online Free
Start playing 16×16 Sudoku instantly with no download required. Our online game includes:
Multiple difficulty levels (beginner to extreme)
Auto-save and resume anytime
Hints, notes, and smart solving tools
16×16 Sudoku Difficulty Levels
Choose a difficulty level that matches your skill:
Beginner
Many given digits, great for learning the 16×16 format
Easy
Guided introduction with moderate clues
Medium
Balanced challenge for experienced solvers
Hard
Advanced strategies and sustained focus required
Expert
Very few clues, deep logical deduction needed
Extreme
The ultimate 16×16 Sudoku challenge
Printable 16×16 Sudoku Puzzles (PDF)
Download and print high-quality 16×16 Sudoku PDF puzzles. Perfect for dedicated solvers, classrooms, or puzzle collections. Available in multiple difficulty levels.
What is 16×16 Sudoku?
16×16 Sudoku (also called Hex Sudoku) is the largest standard Sudoku variant with a 16×16 grid. It uses digits 1–9 plus letters A–G (representing 10–16) in each row, column, and 4×4 box. With 256 cells to solve, it offers the deepest Sudoku experience available.
Rules and solving flow
- Fill each row with digits 1–9 and letters A–G
- Each column must also contain all 16 symbols
- Each 4×4 box must contain 1–9 and A–G
- No symbol repeats in any row, column, or box
Solving strategy
Take a systematic approach – 256 cells is a lotFocus on one section at a timeUse pencil marks extensivelyLook for rows/columns with many given symbolsThe center 4×4 boxes are good starting points
Why play online
- Free unlimited puzzles
- No download required
- Playable on mobile and desktop
- Built-in hints and tools
- Multiple difficulty levels
More variations
16×16 Hex Sudoku
Standard 4×4 box layout
12×12 Sudoku
Mid-size 144-cell grid
Alphabet Sudoku
Letters-only large format
Giant Sudoku
Beyond 16×16 dimensions
16×16 Sudoku FAQ
Is 16×16 Sudoku harder than 9×9?
Yes. With 256 cells and 16 symbols (including letters), it requires much more focus, systematic thinking, and time to solve.
Can I play 16×16 Sudoku online for free?
Yes. You can play unlimited free 16×16 Sudoku puzzles online with no download required.
Are there printable 16×16 Sudoku puzzles?
Yes. You can download and print 16×16 Sudoku PDF puzzles in multiple difficulty levels.
What do the letters A–G mean in 16×16 Sudoku?
A represents 10, B = 11, C = 12, D = 13, E = 14, and F = 15. The digit 16 is usually written as 'G' or '10' in hex notation.
