Title says it all. After I completed the campaign, I originally just replayed missions. Then I saw that "Five" and Kino der Toten were available to play, and I thought, Well, why not? Now... goddammit, I'm addicted to zombies! I love hearing JFK saying classic one-liners when killing zombies, as well as Nixon. (But I don't like Richtofen. His voice just freaks me out.)
The furthest I've got is... round four. :*( Any good tips for playing "Five" and Kino der Toten on solo?