About SudokuDay
Play free online Sudoku puzzles from easy to hard, with notes, hints, undo, resume, and daily streak tracking.
Open Fast and Start Playing
You can start a puzzle without logging in or signing up. Core pages are served as static HTML, and only a small game script runs in the browser.
Your Records Stay on Your Device
Saved progress, daily streaks, personal best times, and settings are stored in this browser's localStorage. They are not sent to a server or synced across devices by default.
A Reason to Come Back Each Day
The daily challenge is date-based, so the same puzzle appears on the same day. Difficulty-based practice modes let you keep playing after the daily puzzle.