"Everything in Spelunky was designed with a similar sensibility, where we're trying to draw out the personality of each area, of each monster, from very simple actions and things that they do. And when they all come together, you get this complexity that's very interesting, and that makes every time you play in this randomized environment fun— because you start to see — over time — all the different patterns that can arise. [...] That's the emergent gameplay that comes out of it."