Development occurs in language-specific directories:
| HHVM | stars | Kotlin | stars |
|---|---|---|---|
| Day1.hack | ⭐⭐️️ | Day01.kt | ⭐⭐️ |
| Day2.hack | ⭐️ | Day02.kt | ⭐ |
| Day3.hack | Day03.kt | ⭐⭐️ | |
| Day4.hack | Day04.kt | ⭐⭐️ | |
| Day5.hack | Day05.kt | ⭐⭐️ | |
| Day6.hack | Day06.kt | ⭐⭐️ | |
| Day7.hack | Day07.kt | ⭐⭐️ | |
| Day8.hack | Day08.kt | ||
| Day9.hack | Day09.kt | ⭐⭐️ | |
| Day10.hack | Day10.kt | ⭐⭐️ | |
| Day11.hack | Day11.kt | ⭐⭐️ | |
| Day12.hack | Day12.kt | ⭐⭐️ | |
| Day13.hack | Day13.kt | ⭐⭐️ | |
| Day14.hack | Day14.kt | ⭐️⭐ | |
| Day15.hack | Day15.kt |