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Advent of Code 2021

Screenshot of adventofcode.com captured 2026-07-20
Page preview · captured 2026-07-20

Resurfaced independently across 8 calendar years, with breakout response in 4 of them.

submissions
24
submitters
22
observed span
2015–2025
peak thread · 264 comments
725 pts
latest 20+ return · 2023-11-28
134 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

I love adventofcode. I have a rule I follow now which makes it a lot more enjoyable: if I can't make headway on a problem after trying for a day or so, I'll use the subreddit to find a hint, and then usually that's enough to help me to the answer. Very occasionally I just completely cheat (often the pure math based questions). I don't like missing out on the stars.... I mean it's the only way you get to…

Found it in 2016 and have done it ever since (and in the early days of December 2016 I went back and did the 2015 puzzles I'd missed). I was one of the 271 people who had all 200 stars (i.e. completed all puzzles) when Eric tweeted out that stat. Usually takes anything from 5 minutes to an hour do most puzzles, quickly hacked together in perl. Very occasionally there's one that takes longer than that. Sometimes I redo them…

alexfoo·204-point thread·

Love this. I did the first couple of days within irb (Ruby REPL) before deciding to actually write scripts, seeing the second exercise for a given day builds on the first. Found it interesting there's a "Leader board" since well, there's no "points" to accumulate other than completing two puzzles per day, so whomever is listed there is just those 100 who came to see the puzzles first. So far they're not very hard, but still fun.

This might be a contentious take but I have concluded that people that work in tech need to adjust to the idea that "coding" as a sole technical proficiency will become increasingly less valuable as time goes on, and other technical skills that don't necessarily involve "coding" (such as OS knowledge, networking, etc.) will become more valuable. In other words I feel really bad for bootcamp people right now.

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
4

100+ points or 50+ comments

Total points
1338

reference only — not used in Hall rules or ranking

Total comments
548

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2015-12-01Advent of Code – solve a puzzle every dayxPaw91
2015-12-02Advent of Codeingve20
2015-12-03Advent of Codemmastrac20
2015-12-04Advent of Codekissmd30
2015-12-04Advent of Code – solve a puzzle every dayFirst breakoutxPaw20147
2016-11-30Advent of Code 2016aarestad10
2016-12-02Advent of Code has re-openedRiderOfGiraffes30
2016-12-02Advent of Code restarts for 2016RiderOfGiraffes20
2017-11-28Advent of code 2017 dropping midnight Dec First ESTmgdo10
2017-11-29Advent of CodeSwizec10
2017-12-01Advent of Code 2017loisaidasam30
2017-12-05Advent of Code 2017vog10
2018-12-03Advent of Code 2018lobo_tuerto30
2018-12-29Show HN: Advent of Code is an Advent calendar of small programming puzzlesrishabhd10
2019-09-13Advent of Codepmoriarty20
2019-11-28Advent of Code 2019nneonneo20472
2021-11-29Advent of Code 2021dunefox20
2021-11-30Advent of Code 2021theonewolf30
2021-12-01Advent of code 2021 has startedkeyle220
2021-12-01Advent of Code 2021Hall induction · Best threadducharmdev725264
2023-11-27Advent of Code 2023freilanzer63
2023-11-28Please don't use AI to solve Advent of CodeLatest 20+ point returnsaikatsg134160
2025-10-22Advent of Code 2025, there will be 12 days of puzzlespraseodym41
2025-11-27Advent of Code 2025 is nigh – Dec 1-12vismit200030