Oh these i18n puzzles were just great! I just finished 19 of 20 of them and I can recommend as probably even better than AoC.
Especially the later ones were sometimes really hard, and not because they were about some hard algorithmic problems but about very much real life problems and limitations of our platforms (e.g. jvm).
I learned a ton of importance of updating tzdb, how to hack someone with bidi or why string.indexOf is your enemy 😁
Thanks for sharing that event 🙂