K-1 World GP: Zettai Ouja Ikusei Keikaku

This is a complete, playable map of World 1-1 from the original Super Mario Bros. in just 1KB of compressed code. It's basically a proof-of-concept for a number of super-condensed game systems that I've been working on, but hopefully it's fun to play around with, too.
Controls:
Arrow keys: Move
X button: jump