Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. -reference
Each day of December, a new 2-part puzzle is released. I will at least attempt to do part 1. Python is my "native" language so I'll definitely be using it. However, there is a twist. I will also be solving the puzzles in Ruby.
I like the idea of doing the same work in multiple different languages. It helps me understand the differences and gives me things to look back at. I suppose it also allows me to publically prove that I've done things with Ruby.