This was my tenth(!) year building 25 days of puzzles for #AdventOfCode. You can solve them all for free! Most people write code to solve them, but you can solve them however you like. I hope they help people become better programmers. 🌟

The first puzzle comes out in two hours: https://adventofcode.com/

Advent of Code 2025

@ericwastl Congratulations. I enjoyed solving some last year. I did one with a small spreadsheet. I also liked how some puzzles were brute-forceable, but the second part wasn’t and forced you to approach it differently (the planting manual for example.)