A three-level solo scenario where the bobs are your enemies, and everything else (well, almost everything) is on your side. (Comes with a physics model to make it work.) Well-planned levels take advantage of situations where bobs are superior, fighting-wise... pretty difficult, even on Normal.
6 Maps. A couple of these are big, but most can be played with small groups, so I classified it as Small. These are really good... They range from amusing (maps in the shape of people or fish) to addictive (Phort and Capture the Flag are great for team games). Very enjoyable.