Mental Math
Make numbers feel easier
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Free KenKen practice with no signup
Start with Free KenKen Practice
Practice KenKen online free in your browser with no signup required. Start with instant beginner-friendly puzzles, adjust size and difficulty, and move into competition only when you want it.
No signup for practice. Create an account only when you want 1v1 and progress tracking.
📖 Learn KenKen Rules100K+Players
100K+Puzzles
4.9★Rating
6×
3
1
96×
2
3-
4
2
3
4
1
1
4
3=
3
1-
2
4=
4
1-
2
1
3
BRAIN TOOLKIT
Every puzzle trains a new superpower
Logic Detective
Spot hidden patterns and clues
Focus Mode
Stay calm and think ahead
Confidence Boost
Turn small wins into progress
Start with practice, then choose your next challenge
🧠
Sharpen Your Mind
Improve logic, math, and pattern recognition skills.
Track Progress
Detailed stats, Elo rating system, and achievement badges.
Compete Globally
Global Ranking Competition
What is a KenKen arithmetic puzzle?
KenKen is an arithmetic logic puzzle invented by Japanese educator Tetsuya Miyamoto. Also searched as Calcudoku or Mathdoku, it combines cage calculations with Sudoku-like row and column logic to build mental math and problem-solving skills.
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Arithmetic Practice
Master addition, subtraction, multiplication, and division naturally.
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Logical Reasoning
Develop deductive thinking through constraint-based puzzles.
Educational Value
Used in classrooms worldwide to make math fun and engaging.
⚡
Pure Entertainment
Addictive gameplay that keeps you coming back for more.
Loved by Players Worldwide
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PuzzleElo has become my daily brain workout. The 1v1 matches are incredibly addictive, and I've improved my mental math significantly!
Alex M.Daily Player
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As a math teacher, I use PuzzleElo assignments with my students. They love competing on the class leaderboard while learning arithmetic!
Sarah K.Middle School Teacher
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The Elo rating system keeps me motivated. It's satisfying to see my ranking improve as I get better at solving puzzles faster.
James L.Competitive Player, Top 100
Frequently Asked Questions
Is PuzzleElo free to play?
Yes! PuzzleElo offers unlimited free practice mode and daily puzzles. Premium membership unlocks additional features like detailed analytics, larger puzzle sizes, and an ad-free experience.
What puzzle sizes are available?
We offer puzzles from 3×3 (beginner-friendly) to 12×12 (expert level). Each size has its own Elo rating, so you can progress at your own pace.
How does the Elo rating work?
Your Elo rating is calculated based on puzzle difficulty and completion time. Solving harder puzzles faster earns you more points, while easier puzzles or slower times yield fewer gains. Each puzzle size has its own rating curve!
Ready to start solving right now?
Open a free practice puzzle first. Move into 1v1 only after you are warmed up.
Start Free Practice