KenKen (also known as Calcudoku, Mathdoku, or Newdoku) is a mathematical logic puzzle that combines arithmetic operations with sudoku-style constraints. Players fill a grid with numbers so that no number repeats in any row or column, while ensuring that numbers in outlined areas (cages) satisfy specific mathematical operations and targets.

How is KenKen different from Sudoku?

Unlike Sudoku, KenKen requires mathematical calculations. Each outlined area (cage) has a target number and mathematical operation (+, -, ×, ÷) that must be satisfied. KenKen also comes in various grid sizes (3×3 to 9×9) while Sudoku is typically 9×9.

Is Daily KenKen free to play?

Yes, Daily KenKen is completely free to play. No registration, downloads, or subscriptions required. Simply visit the website and start solving today's puzzle immediately.

What math skills do I need for KenKen?

KenKen requires basic arithmetic skills: addition, subtraction, multiplication, and division. The math is typically simple (single-digit numbers), but the challenge comes from the logical reasoning required to find the correct number combinations.

Complete KenKen Guide

Master the complete art of KenKen puzzles (also known as Calcudoku, Mathdoku, or Newdoku) with our comprehensive guide covering rules, strategies, tips, and comparisons. Everything you need to become a KenKen expert!

Quick Navigation

📋 Basic KenKen Rules 🧮 Understanding Cage Operations 🧠 Solving Strategies 💡 Pro Tips & Techniques

⚡ KenKen vs Sudoku ❌ Common Mistakes 🏆 Benefits of Playing 🚀 Getting Started

Basic KenKen Rules

The Three Fundamental Rules

These rules apply to KenKen (also called Calcudoku, Mathdoku, or Newdoku):

Fill every cell: Each row and column must be filled with numbers from 1 to the grid size (e.g., 1-4 for a 4×4 grid, 1-6 for a 6×6 grid).

No repeats: Numbers cannot repeat within the same row or column (similar to Sudoku).

Cage constraints: Numbers in each outlined area (cage) must satisfy the mathematical operation and target number shown.

Understanding Cage Operations

+Addition Cages

All numbers in the cage must add up to the target number.

Example: A cage showing "12+" with cells [3, 4, 5] ✓
Because: 3 + 4 + 5 = 12

×Multiplication Cages

All numbers in the cage must multiply to equal the target number.

Example: A cage showing "24×" with cells [3, 2, 4] ✓
Because: 3 × 2 × 4 = 24

−Subtraction Cages

The larger number minus the smaller number equals the target.

Example: A cage showing "3−" with cells [5, 2] ✓
Because: 5 − 2 = 3

÷Division Cages

The larger number divided by the smaller number equals the target.

Example: A cage showing "3÷" with cells [6, 2] ✓
Because: 6 ÷ 2 = 3

🔢Single-Cell Cages

Cages with only one cell show just a number (no operation symbol). Simply enter that exact number in the cell. These are often the easiest to solve first!

Solving Strategies

🎯 Start with Easy Cages

• Single-cell cages (immediate answers)
• Two-cell cages with limited possibilities
• Large numbers in small cages
• Small targets with few combinations

🧮 Use Elimination

• Rule out impossible combinations
• Check row/column constraints
• Use pencil marks for possibilities
• Cross-reference multiple cages

🔍 Look for Patterns

• Unique factor combinations
• Limited arithmetic possibilities
• Interconnected cage relationships
• Forced moves and logical deductions

⚡ Advanced Techniques

• Cage interactions and overlaps
• Forcing chains in complex grids
• Systematic trial and error
• Working backwards from constraints

Pro Tips & Techniques

🎮 Beginner Tips

• Start with 4×4 grids before trying larger puzzles
• Practice basic arithmetic to speed up solving
• Don't guess - every move should be logical
• Take breaks if you get stuck
• Use the hint feature sparingly to learn

🚀 Expert Techniques

• Memorize common factor combinations
• Look for "forcing" cages first
• Use symmetry in grid design
• Practice speed solving techniques
• Develop pattern recognition skills

🧠 Mental Math Tips

Quick Multiplication:

• 12 = 3×4, 2×6
• 24 = 3×8, 4×6, 2×12
• 30 = 5×6, 3×10

Addition Shortcuts:

• Look for pairs that sum to 10
• Use complement arithmetic
• Break large sums into smaller parts

KenKen vs Sudoku: Key Differences

Feature	KenKen	Sudoku
Math Skills Required	✅ Yes (Addition, Subtraction, Multiplication, Division)	❌ No (Pure logic)
Grid Size	3×3 to 9×9 (variable)	9×9 (standard)
Constraints	Mathematical operations	No repeats in 3×3 boxes
Learning Curve	Moderate (rules + math)	Easy (simple rules)
Mental Skills	Logic + Arithmetic	Logic + Pattern recognition

Try KenKen If You:

✅ Enjoy math and arithmetic
✅ Like puzzles with variety in size
✅ Want to improve mental math skills
✅ Appreciate mathematical problem-solving
✅ Are looking for something new and different

Stick with Sudoku If You:

✅ Prefer pure logic puzzles
✅ Enjoy pattern recognition
✅ Like consistent grid sizes
✅ Want to avoid arithmetic
✅ Are comfortable with familiar rules

Common Mistakes to Avoid

❌

Forgetting the row/column rule:

Numbers must not repeat in any row or column, even if the cage math works out.

❌

Ignoring cage boundaries:

Only numbers within the same outlined cage need to satisfy the operation.

❌

Misunderstanding operations:

For subtraction and division, order matters: largest ÷ smallest or largest − smallest.

❌

Guessing instead of reasoning:

Every move should be backed by logical deduction, not random guessing.

Benefits of Playing KenKen

🧠 Cognitive Benefits

• Improves logical reasoning
• Enhances problem-solving skills
• Strengthens working memory
• Increases mental flexibility

🔢 Mathematical Skills

• Improves mental arithmetic
• Reinforces basic operations
• Develops number sense
• Enhances calculation speed

😌 Mental Wellness

• Reduces stress and anxiety
• Provides meditative focus
• Boosts confidence
• Offers sense of achievement

📚 Educational Value

• Great for students of all ages
• Reinforces classroom learning
• Makes math fun and engaging
• Develops persistence

Ready to Get Started?

Your KenKen Journey Starts Here!

Now that you understand all the rules, strategies, and techniques, it's time to put your knowledge into practice with today's daily puzzle.

Beginner

Start with 4×4 grids

Easy difficulty

Intermediate

Progress to 6×6 grids

Medium difficulty

Expert

Challenge 9×9 grids

Hard difficulty