Specimen VII · 06
Advent of Code
free
Annual December puzzle event
Scaled to 12 puzzles + no global leaderboard in 2025 due to AI solvers and DDoS. Private leaderboards still work. Free.
| Habitat | Competitive |
| Access tier | free |
| Relevance to stack | medium |
| Last active signal | AoC 2025 Dec 1-12 (reduced format) |
| Verified alive | yes — pressed 2026 |
| Specimen no. | VII · 06 |
| Live habitat | https://adventofcode.com |