I wrote an explainer for today's #AdventOfCode puzzle. It's a beam machine (cf. "bean machine") for Plinko!

https://www.reddit.com/r/adventofcode/comments/1pgxv5w/year_2025_day_7_no_memoization_still_runs_in_10_µs/

Updated with a siginicant simplification, now runs in 5.6 µs.