Ask HN: What piece of code/codebase blew your mind when you saw it?
Handmade Hero.<p>Before warching Casey program, it had not occurred to me you could sit down with a compiler and write an entire video game from scratch.<p>Then, I found out Jonathan Blow sat down and wrote his own compiler, followed by an engine, and now has a game in flight.<p>It's a truly incredible what these guys (and their teams) get done.