My Advent of Code solutions for 2025! Advent of Code is a series of 12 puzzles, one released each day starting December 1st! I attempt to complete Advent of Code every year, but rarely do. This is a casual completion run, not necessarily for maximum points.
Our 2025 leaderboard for Advent of Code is 219042-9f06f774. Enter the code on the leaderboard page to join.
You can find previous years here:
First, set your ruby version.
asdf install ruby 4.0.0-preview2
Next, run the installation script.
rake install
Run the test cases to confirm results.
rake spec
Run rake new_day[1] in order to create a new set of solution, input, and spec files.
Put binding.irb anywhere to pry into the method while running the spec. exit! will exit the debugging session.