Starting November 1st, you can register for the MATH+ Advent Calendar 2025 as an individual or as a class.
From December 1 to 24, the calendar will open a new window every day at 4 pm, revealing a tricky math puzzle.
To pass the time in November, you can have a look at the challenges and solutions of the past years in our challenge archive or study the rules of the contest.Last year, the Math Advent Calendar celebrated its 20th anniversary. To mark this occasion, we created a few puzzles that you can solve here.