Advent of Code 2025
Hi! I’m Eric Wastl. I make Advent of Code. I hope you like it! I also make lots of other things. I’m on Bluesky, Mastodon, and GitHub. Advent of Code is an Advent calendar of small programming puzzles for a variety of skill levels that can be solved in any programming language you like. People use them as interview prep, company training, university coursework, practice problems, a speed contest, or to challenge each other. You don’t need a computer science background to participate – just a little programming knowledge and some problem solving skills will get you pretty far. Nor do you need a fancy computer; every problem has a solution that completes in at most 15 seconds on ten-year-old hardware. If you’d like to support Advent of Code, you can do so indirectly by helping to [Shareon…
