The world's first fully decentralized competitive Sudoku platform — built on the Internet Computer blockchain.
Sudoku is one of the most beloved logic puzzles in the world. The goal is beautifully simple: fill a 9×9 grid so that every row, every column, and every 3×3 box contains the digits 1 through 9 exactly once. No math required — just logic, pattern recognition, and patience.
First published in the United States in 1979 and popularized in Japan in the 1980s under the name "Sudoku" (meaning "single number"), it has since become a global phenomenon enjoyed by millions.
Sudoku Challenge isn't just another Sudoku app. It's a full-featured competitive platform where players compete in real-time tournaments, climb the global rankings through a skill-based rating system, and prove themselves in head-to-head duels — all powered by decentralized blockchain technology with zero tracking and true data ownership.
Our puzzles span five difficulty levels, each with a dedicated score range:
With over 150,000 puzzles in our database, you'll never run out of challenges.
Sudoku Challenge runs entirely on the Internet Computer Protocol (ICP) — a next-generation blockchain that operates at web speed. Privacy by design, decentralized hosting, no personal data collected, and web-speed performance.
Sudoku Challenge is completely free to play — and always will be. For players who prefer an uninterrupted experience, we offer a Premium subscription that removes all advertisements. Premium is purely about comfort — it does not provide any gameplay advantage.
Have a question, suggestion, or found a bug? Email us at support@sudokuchallenge.com.