Happy Puzzle #100! I wanted to get this milestone right, so I spent a lot of time brainstorming ideas. Unfortunately, I ended up with six puzzles I liked a lot and no way to choose between them. So, I gave each puzzle a number, rolled a die, and decided to publish the puzzle whose number came up.
I rolled a three, so here's the puzzle I chose; thanks to David Gold for testing! The meta answer is a word associated with chaos.