Advent of Code 2025 Setup Install OCaml and Nushell. Set your Advent of Code session: $env.AOC_SESSION="your_session_cookie" $env.AOC_YEAR = 2025 Initialize Project nu aoc.nu init --lang --days Run a Solution this will run day 1 part 1 nu aoc.nu run 1 1 Help nu aoc.nu --help