Free Daily Sudoku Puzzle Online

DaySudoku is a free daily Sudoku puzzle online: one Sudoku a day, built for a quick focused break in your browser.

Play one Sudoku a day

Each local day brings one DaySudoku puzzle. Open the site, start today’s board, solve the Key9 challenge, and continue into the full Sudoku when you are ready. There is no sign-up, no download, and no account required.

What makes DaySudoku different

DaySudoku starts with Key9 Sudoku. Instead of dropping you into an unlimited puzzle list, it gives you one daily board with nine marked cells to solve first. That opening challenge makes the daily Sudoku feel short, focused, and easy to share.

How the Key9 challenge works

The board has nine marked Key9 cells. Their solution digits are 1 through 9 exactly once. Select a marked cell, place the matching number, and try to unlock the full Sudoku before 9 misses.

Why play daily Sudoku online

A daily Sudoku puzzle gives you a simple habit without a long setup. DaySudoku works in the browser, saves today’s progress locally, and keeps the experience centered on today’s puzzle rather than accounts, leaderboards, or endless mode selection.

Start today’s puzzle

Play today’s DaySudoku and find the Key9, or read more about how Key9 Sudoku works.