Advent of Code 2025 in Kotlin: Puzzles, Prizes, and Community | The Kotlin Blog

Advent of Code 2025 in Kotlin was celebrated with a vibrant community spirit, featuring five days of livestreams where Sebastian Aigner and guests tackled puzzles using idiomatic Kotlin approaches. The event fostered collaborative problem-solving and community engagement through the #advent-of-code channel on Slack, where participants shared creative snippets, hints, and encouragement. The competition recognized nine winners across three categories: Fastest to Solve, Random, and Community, highlighting individuals for their speed, participation, and community contributions. The event continues to offer learning resources, including a YouTube playlist and tutorials, encouraging ongoing engagement with Kotlin and algorithmic challenges beyond the festive season.