Earlier quoted context omitted.
I’ve been trying to design a puzzle for a game this year that humans can solve but LLMs can’t. I’ve come up with one, but it was hard work! It’s based around message cracking.
For more examples of such problems check Jane street puzzles of the month
Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
211–220 of 226 posts
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#212I see the leaderboard is gone too. Unfortunate but entirely predictable given how the last 2 years went. That being said, I was worried he'd cancel the entire thing, so this is still good news!
>predictable given how the last 2 years went QRD? Was it AI?
But yes, you would have people openly share repositories for automatically ingesting the puzzle text, solving the puzzles, and submitting the results the moment the puzzles opened, leading to inhuman solution times. So, despite the rules stating that you can't do that, the result is that whenever the puzzles were easy enough for an LLM to solve them with high probability – and most of them are – the leaderboards would be overrun with such solutions.
In 2023, the LLMs would still struggle enough that the overall leaderboard (taking all 25 ⋅ 2 puzzles into account) would still be dominated by ordinary people (many of them recording their solutions), in 2024 that was no longer the case. Personally I would go from being able to top 100 regularly, to almost never being able to. I'm going to miss the thrill, and think it's a bit saddening that we can't have nice things, but also ultimately think that getting rid of it is the best option.
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#213Earlier quoted context omitted.
>predictable given how the last 2 years went QRD? Was it AI?
Yeah, a bunch of people started going on witch hunts against the people where were obviously using AI (eg ~30 second solve times) and also anyone who had "AI" anywhere in their bio. IMO the levels it got to was wildly out of proportion, even if these people were cheating (say what you will about AI, but if the rules say not to use it and you do: you're a cheater) but maybe I would have felt differently if the timezon…
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#214Earlier quoted context omitted.
>predictable given how the last 2 years went QRD? Was it AI?
Yeah, a bunch of people started going on witch hunts against the people where were obviously using AI (eg ~30 second solve times) and also anyone who had "AI" anywhere in their bio. IMO the levels it got to was wildly out of proportion, even if these people were cheating (say what you will about AI, but if the rules say not to use it and you do: you're a cheater) but maybe I would have felt differently if the timezon…
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#215Earlier quoted context omitted.
>predictable given how the last 2 years went QRD? Was it AI?
There's some good discussion here: https://old.reddit.com/r/adventofcode/comments/1h9cub8/discu... But yes, you would have people openly share repositories for automatically ingesting the puzzle text, solving the puzzles, and submitting the results the moment the puzzles opened, leading to inhuman solution times. So, despite the rules stating that you can't do that, the result is that whenever the puzzles were easy e…
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#216Earlier quoted context omitted.
> The 25 is there in the name. This largely depends on who you're asking? I don't know anyone who wouldn't consider 24 the course correct number of Advent, simply because that's the common number here (we celebrate Christmas on the 24th). So 12 makes perfectly sense, just do every second day. There are also many groups who don't start on the 1st of December, but on the first Sunday of Advent. And probably many others…
Advent calendars are used to count down the days. Doing one every other day defeats the purpose.
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#217Earlier quoted context omitted.
Gonna miss it. So fun to see how fast one can parse the problem, figure out how to solve it while thinking of edge cases, and then actually write and run it. I've never been high up on the leaderboard, but enjoyed waking up early in December and give it a crack. Most often rank ~1000, a few times ~100. But I also understand the decision. Fun while it lasted, but I'll find other ways to have fun with AoC this year!
In the earlier years, maybe. Last year you’d immediately see a 3m47s time for a puzzle that for most people would take at least an hour. Unless you were actively watching the clock for a new puzzle daily, odds are it would have already been solved a thousand times over by the time you started. It’s like excitedly arriving to a potluck with your beef bourguignon, only to find twenty michelin-starred chefs competing ag…
As for when it's been solved a thousand times: 2022 I did part1 and part2 and was finished after 4m36seconds, and that gave me rank 1070. So don't underestimate how many who did this competitively, heh.
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#218Earlier quoted context omitted.
It's a reference to a German tradition of Advent Calendar with 24 small doors. Every day from 1st to 24th of December children would open one door and find a candy, a picture, a small toy, a quest etc. depending on calendar's theme
I get it, but Advent calendars are not just German. I am pretty sure they are common all over the western world where Xmas is celebrated. But Advent doesn't in any way mean 25.
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#219Earlier quoted context omitted.
Advent calendars are used to count down the days. Doing one every other day defeats the purpose.
I thought the purpose was to be a fun thing we used to kill time over the holidays
Re: Advent of Code 2025: Number of puzzles reduce from 25 to 12 for the first time
#220Earlier quoted context omitted.
I once has this half serious idea to do "Advent of Parenting", with one problem per month, and you start after Christmas. As in, youre so delayed you start in the New Year, and have time for one problem per month. But hey I didn't have the time to do it. Kids...
> But hey I didn't have the time to do it. Kids... Yep, dont have the kids. And no plan to.
My kids have been the absolute best source of grey hairs in my life.