Best Free Sudoku Websites & Apps: Play Unlimited Puzzles

Plenty of free Sudoku sources:

Top Websites

• Sudoku.com: sudoku.com — Clean UI, daily puzzles, 6 difficulties, pencil marks, stats.
• Web Sudoku: websudoku.com — Classic, simple, billions of puzzles, printable.
• Sudoku.org: sudoku.org — Variations (Killer, Jigsaw), tutorials.
• Logic-Puzzles.com: logic-puzzles.com — Sudoku + KenKen, Hashi, more.

Newspaper Sites (Daily)

• NY Times Games: nytimes.com/games/sudoku — Polished, archive for subscribers.
• The Guardian: theguardian.com/crosswords/sudoku — Free, multiple difficulties.

Mobile Apps (iOS/Android)

• Sudoku by Conceptis: Huge library, great UI, free + optional purchases.
• Sudoku by The Numbers: Clean, feature-rich.
• Good Sudoku (iOS): Teaches techniques as you play (by Zach Gage).
• OpenSudoku (Android/F-Droid): Open-source, no ads.

All free, all endless. Pick your interface style!