A door every day
From 1 to 24 December a new door opens every day with a Christmas sudoku – with 🎄 trees, 🎁 presents, 🎅 Santa and ⛄ snowmen. Doors only open on their day, but missed doors can be played later.
The first twelve puzzles are easy; from 13 December they get a little trickier. You choose the size (4×4, 6×6 or 9×9), so the calendar works for preschoolers and school kids alike.
For families and classrooms
- Morning ritual: open and solve the door of the day together.
- In class: solve the daily door on the whiteboard – no sign-up, no ads.
- Prefer paper? The whole calendar with 24 puzzles is available as a PDF above; more printable sheets are on the Christmas sudoku and winter sudoku pages.
Frequently asked questions
When does the advent calendar open?
The first door opens on 1 December, then one door a day until 24 December. All doors can be replayed until the end of January.
Is the advent calendar free?
Yes. It is free, with no sign-up, no ads and no cookies.
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