The 2024 calendar has ended and its leaderboard is final. Every problem stays open for practice, but correct answers no longer earn points.

1. 01 2024-12-01 Debugging Christmas practice released!
2. 02 2024-12-02 Sn0wdrift Network practice released!
3. 03 2024-12-03 Faulty Mint Boosters practice released!
4. 04 2024-12-04 JollyScript Bootcamp practice released!
5. 05 2024-12-05 Christmas Ornament Quality Control practice released!
6. 06 2024-12-06 A Villain Rises... practice released!
7. 07 2024-12-07 skipped
8. 08 2024-12-08 Meltdown practice released!
9. 09 2024-12-09 Great Elf Census practice released!
10. 10 2024-12-10 Offensive Naughtiness Reduction practice released!
11. 11 2024-12-11 Reindeer Racing practice released!
12. 12 2024-12-12 Snowfall Prediction practice released!
13. 13 2024-12-13 How elves are made. practice released!
14. 14 2024-12-14 Elf Internships. practice released!
15. 15 2024-12-15 JollyStreet Advertising practice released!
16. 16 2024-12-16 Song Re-Constructor 6174 practice released!
17. 17 2024-12-17 Elf Quality Control practice released!
18. 18 2024-12-18 Sn0wdrift? practice released!
19. 19 2024-12-19 Decoy Sleigh practice released!
20. 20 2024-12-20 Did you mean: pico? practice released!
21. 21 2024-12-21 skipped