Yeah, from what I've heard prestiging makes you lose it if it's a prestige level that unlocks a custom slot, otherwise you keep it until you prestige and open a slot. Forgot it's ten more levels, that makes sense although I think I'm at 40 or so. I'll FR you for nazi zombie madness. We'll need two more right?
Doesn't necessarily matter, can play it with up to four. Did you send me a FR? I think I accidentally deleted it heh