Betty Bee Sudoku

Free daily Sudoku puzzles in your browser — a fresh grid every day at five difficulty levels from Easy to Insane, plus unlimited Quick Play and the Sudoku X diagonal variant. Global leaderboards, friend rivalries, win streaks, and zero ads anywhere on any tier. No download and no account needed to start; it installs as an app on iOS and Android and plays in nine languages.

Playing needs JavaScript. Start here:

• Today's daily Sudoku puzzle
• How to play Sudoku — rules and FAQ
• Sudoku solving techniques by difficulty
• Interactive Sudoku tutorial
• Sudoku X — the diagonal variant