"Advent of Code" has begun. New programming puzzles will appear every day until Christmas at AdventOfCode.com — and the annual event (first started in 2015) has grown into a worldwide phenomenon. This year's first puzzle has been completed by over 150,000 programmers (with another 115,652 completing Day Two's puzzle). And 108,000 fans have also joined the Advent of Code subReddit.

Contest-related comments are popping up all around the web. Some participants are live streaming their puzzle-solving efforts on Twitch. Self-described computer nerd Gary Grady is tweeting cartoons about each day's puzzle. JetBrains is even giving away some prizes in their "Advent of Code with Kotlin" event. And JetBrains developer advocate Sebastian Aigner is also hosting daily livestreams about each puzzle.

It's hard to overstate how big this event has become. This year's event attracted 60 sponsors, including Kotlin (for the third consecutive year), as well as Spotify, Shopify, and Sony Interactive Entertainment (as well as JPMorgan Chase, Bank of America, and American Express). Individual donors can get a special badge next to their name, and there's also a shop selling coffee mugs and t-shirts. But at its core is real-world developer Eric Wastl (plus a team of loyal beta-testers) sharing his genuine fondness for computer programming. Wastl is also the creator of a satirical web page for the fast, lightweight, cross-platform framework Vanilla JS ("so popular that browsers have been automatically loading it for over a decade") and also curates a collection of "things in PHP which make me sad".

And you can find him on X sharing encouraging comments for this year's participants.