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.

HabitatCompetitive
Access tierfree
Relevance to stackmedium
Last active signalAoC 2025 Dec 1-12 (reduced format)
Verified aliveyes — pressed 2026
Specimen no.VII · 06
Live habitat https://adventofcode.com
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