Live Sudoku is an online destination for Sudoku players, created by Hagai Izenberg in 2006 and now serving a community of more than 100,000 players worldwide. The site offers free puzzles in four difficulty levels: easy, medium, hard, and evil. Each puzzle has a unique solution and can be completed using logic, without guessing. Players can use hints that explain the next logical step, pencil marks, digit highlighting, progress checks, and undo controls, while a timer adds an optional challenge.

Live Sudoku also features daily puzzles, statistics and score tracking, and real-time multiplayer games where players can compete against one another. Visitors can explore tutorials and strategy guides, covering beginner techniques such as scanning for missing digits and finding hidden singles, as well as advanced methods including X-Wing and Swordfish. For an offline option, the site provides free printable Sudoku puzzles. Play is available without signing up, while creating an account enables multiplayer play and additional features such as earning points and pursuing high scores.