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Unlimited free Killer Sudoku puzzles
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Classic Sudoku
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Killer Sudoku
Play Killer Sudoku Online – Free Killer Sudoku Puzzles
Play Killer Sudoku online for free – a challenging Sudoku variant that combines logic with math. Each cage must sum to a given target value. Whether you're looking for easy, medium, hard, or expert Killer Sudoku puzzles, play instantly in your browser or download printable Killer Sudoku PDFs for offline solving.
+−×÷ cage sums
9×9 math puzzle
6 difficulty levels
Core experience
Play Killer Sudoku Online Free
Start playing Killer 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
Killer Sudoku Difficulty Levels
Choose a difficulty level that matches your skill:
Beginner
Fewer cages with simple sums, perfect for beginners
Easy
More guided puzzles with moderate cage counts
Medium
Balanced challenge combining cages and logic
Hard
Complex cage layouts and larger target sums
Expert
Minimal cages, maximum reasoning required
Extreme
Ultimate Killer Sudoku challenge
Printable Killer Sudoku Puzzles (PDF)
Download and print high-quality Killer Sudoku PDF puzzles. Perfect for offline play, classrooms, or puzzle books. Choose from easy, medium, hard, and expert levels.
What is Killer Sudoku?
Killer Sudoku is an advanced Sudoku variant that adds cages (dashed outlines) to the standard 9×9 grid. Each cage has a small number in the corner – this is the sum target. All digits within the cage must add up to that target, and no digit repeats within a cage.
Rules and solving flow
- Numbers in each cage must sum to the target value
- No digit repeats within a single cage
- Standard Sudoku rules still apply (1–9 in rows, columns, boxes)
- Use both cage constraints and Sudoku logic together
Solving strategy
Start with small target cagesLook for cages with unique digit combinationsUse row/column/box constraints to eliminate possibilitiesUse pencil marks for potential combinationsBegin with cages that intersect filled cells
Why play online
- Free unlimited puzzles
- No download required
- Playable on mobile and desktop
- Built-in hints and tools
- Multiple difficulty levels
More variations
Classic Killer Sudoku
Traditional addition-only cages
Little Killer Sudoku
Diagonal sum constraints
Zero Killer Sudoku
Includes subtraction operations
Thermo Killer Sudoku
Combined with thermometer constraints
Killer Sudoku FAQ
Is Killer Sudoku harder than regular Sudoku?
Yes. It adds cage sum calculations on top of standard Sudoku rules, requiring stronger logical reasoning.
Can I play Killer Sudoku online for free?
Yes. You can play unlimited free Killer Sudoku puzzles online with no download required.
Are there printable Killer Sudoku puzzles?
Yes. You can download and print Killer Sudoku PDF puzzles in multiple difficulty levels.
What is the best strategy for Killer Sudoku?
Start with cages that have small target values and unique combinations. Use pencil marks to track possible digit sets, then cross-reference with standard Sudoku constraints.
