A new, shared puzzle every day
Today’s board is selected deterministically from the date, so refreshing or opening a new browser does not change it. Tomorrow produces a new, verified Daily Sudoku. Optional live radio is available in the game, but playback always begins only when you press Play.
Same day, same board
The daily generator uses the local calendar date as its seed. That keeps the puzzle consistent throughout a day without an account or a server.
Keep your own completion
Once you finish today’s puzzle, CalmSudoku remembers that completion on this device. Your game stays guest-first and no login is required.