A couple of levels, and a small shapes patch. The first level is seriously claustrophobic, and you'll be hitting your head on the stairs every time you go down. The fun part comes in with the small shapes patch... it gives bobs the opportunity to kill you with more than their normal weapons. (They don't look like they're using flamethrowers and SPNKRs, but they are...) If you can beat this level solo, you're a damn sight better than I am.