Sudoku

Sudoku.by is an online destination for free Sudoku puzzles, offering a range of difficulty levels from Easy to Extreme. Players can start a new puzzle without downloading anything or signing in, and can choose classic Sudoku or explore more than 30 variants. These include Killer, Diagonal, Samurai, Jigsaw, Thermo, Arrow, Kropki, Alphabet and 3D Sudoku, among others.

The site supports casual play and skill development with daily challenges, weekly competitions, leaderboards and game history. Players can use features such as notes, hints, mistake tracking, pause and resume, and puzzle sharing. A free account lets users save games and track progress across devices, while guests can play without an account. Sudoku.by also provides guides to rules and solving techniques, including a beginner’s guide with walkthroughs and advice for different skill levels. For offline use, visitors can print puzzles at various difficulties. Whether someone is learning the basics or seeking a more demanding logic challenge, the site brings puzzles, learning resources and competitive play together in one place.