Advent of Code (English Wikipedia)

Gee, Sue (December 6, 2020). "Advent Of Code For Programmers". I Programmer. Archived from the original on December 6, 2020. Retrieved May 12, 2021.

packtpub.com (Global: low place; English: low place)

Hjelle, Geir Arne (December 1, 2021). "Advent of Code: Solving Your Puzzles With Python". Real Python. Retrieved February 20, 2022.

Joyce, Kara E. (November 11, 2020). "Brain teasers and other fun tips for learning Python". SearchBusinessAnalytics. TechTarget. Archived from the original on November 12, 2020. Retrieved May 12, 2021.

Speed, Richard (December 1, 2021). "On the first day of Christmas, my true love gave to me... a coding puzzle and it's a doozy". The Register. Archived from the original on December 1, 2021. Retrieved December 5, 2021.

Wastl, Eric [@ericwastl] (December 4, 2022). "#AdventOfCode just hit 🌟1,000,000🌟 registered users!!!" (Tweet). Retrieved December 10, 2022 – via Twitter.

Joyce, Kara E. (November 11, 2020). "Brain teasers and other fun tips for learning Python". SearchBusinessAnalytics. TechTarget. Archived from the original on November 12, 2020. Retrieved May 12, 2021.
Speed, Richard (December 1, 2021). "On the first day of Christmas, my true love gave to me... a coding puzzle and it's a doozy". The Register. Archived from the original on December 1, 2021. Retrieved December 5, 2021.
Gee, Sue (December 6, 2020). "Advent Of Code For Programmers". I Programmer. Archived from the original on December 6, 2020. Retrieved May 12, 2021.
Fisher, Kenneth (December 3, 2020). "SQL Homework – December 2020 – Participate in the Advent of Code. from Blog Posts – SQLServerCentral". Packt Hub. Archived from the original on January 26, 2021. Retrieved May 12, 2021.