2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023
| Day | Problem Page | Feel | Solution Page | 😉 |
|---|---|---|---|---|
| 1 | Sonar Sweep | 🌟 | year21/day01 | 📟 |
| 2 | Dive! | 🌟 | year21/day02 | 🎯 🧭 |
| 3 | Binary Diagnostic | 🌟 🌟 | year21/day03 | 🧮 0️⃣ 1️⃣ |
| 4 | Giant Squid | 😵 😵 | year21/day04 | 🐙 🎰 |
| 5 | Hydrothermal Venture | 🤮 | year21/day05 | 📏 📐 |
| 6 | Lanternfish | 🌟 | year21/day06 | 🪣 🏮 ✖️ 🐟 |
| 7 | The Treachery of Whales | 🌟 | year21/day07 | 🦀 ⛽ ⬅️ ➡️ |
| 10 | Syntax Scoring | 🌟 | year21/day10 | |
| 11 | Dumbo Octopus | 🌟 | year21/day11 | 🐙 🔦 |
| 25 | Sea Cucumber | 🌟 🌟 | year21/day25 | 🥒 🌊 |