Advent of Code 2021

Welcome to AoC 2021!

A clumsy elf has dropped the sleigh keys into the ocean. You need to recover the keys in order to save Christmas.

This was a tough AoC. The first half was easy enough. But the second half had a lot of time-consuming challenges. I had taken a few days off work over Christmas. And it was just as well. I needed the time!!

Ready to save Christmas? Follow the links below.

Day Index

1. Sonar Sweep
2. Dive!
3. Binary Diagnostic
4. Giant Squid
5. Hydrothermal Venture
6. Lanternfish
7. The Treachery of Whales
8. Seven Segment Search
9. Smoke Basin
10. Syntax Scoring
11. Dumbo Octopus
12. Passage Pathing
13. Transparent Origami
14. Extended Polymerization
15. Chiton
16. Packet Decoder
17. Trick Shot
18. Snailfish
19. Beacon Scanner
20. Trench Map
21. Dirac Dice
22. Reactor Reboot
23. Amphipod
24. Arithmetic Logic Unit
25. Sea Cucumber