Advent of Code 2021

From the Advent of Code website:

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. People use them as a speed contest,interview prep, company training, university coursework, practice problems, or to challenge each other.

What follows are some visualisation I made for a few of the puzzles. At the time of writing the puzzles are still being unlocked day by day, I will try to do a little write-up later.