Is anyone taking part in the Advent of Code this year?

If you've not heard of it before, the site describes itself as:

Advent of Code is a series of small programming puzzles for a variety of skill levels. They are self-contained and are just as appropriate for an expert who wants to stay sharp as they are for a beginner who is just learning to code. Each puzzle calls upon different skills and has two parts that build on a theme.

I feel like I've seen the site in previous years, but I haven't taken part before. I am having a go this year and I am going to be writing my solutions in Crystal after writing a couple of articles on it earlier this year.

I'm also sharing my solutions on GitHub if you want to check them out. A quick search shows up other solutions too.

Are you having a go at the Advent of Code? Have you got your first two stars yet?