Welcome to Sudoku 16!

Sudoku 16 (Hexadoku) is a thrilling 16×16 variant of classic Sudoku, using numbers 1–16 (or 0–9 & A–F). Challenge your logic with our daily puzzles and multiple difficulty tiers.

How to Play

Fill each row, column, and 4×4 sub-grid with the numbers 1–16 exactly once. No repeats allowed. Use logic and deduction to solve!

🎯 Features

Daily 16×16 Sudoku puzzles
Four difficulty levels: Easy, Medium, Hard, Expert
Save progress & track your stats
Global leaderboards & friend challenges

🧠 Why Play 16×16 Sudoku?

Hexadoku demands more variables and deeper strategies, boosting memory, problem-solving skills, and mental agility.

Memory Boost: Tracking 16 symbols sharpens recall.
Logic Training: Advanced patterns & techniques.
Mental Fitness: Keeps your brain agile and focused.

❓ FAQ

What is 16×16 Sudoku?

Also called Hexadoku or Super Sudoku, it's played on a 16×16 grid split into 4×4 boxes, using numbers 1–16 without repetition.

How do I save my game?

Create an account to automatically save puzzles, track your progress, and compete on leaderboards.

Is it mobile-friendly?

Yes—our layout adapts beautifully to smartphones and tablets for on-the-go puzzling.