Traditionally, with some words of encouragement from https://andeers.com/, I joined https://adventofcode.com/2018. For those who don't know what advent of code is - it's an advent calendar but each day opens not a box with candy or toy but two, small programming puzzles which I really enjoy solving.
You can find my answers for this year's edition here - https://github.com/zaporylie/adventofcode - very basic, test-driven PHP library.