Plus (+) this comment if you want an impossible badge for MNB2! Probably wayyyyyyyyyyyyy too late, but who cares - this is the most re-playable games on here with ever increasing challenge.
Great game and loads of fun, however it doesn't scale right in higher lvls. At lvl 45 I could hardly move due to the slow down of enemies on screen, however I was mowing down enough of them with one shot to gain a lvl at a time. I recommend either having an end point or adjusting spawned zombie numbers. Best combo: revolver+exploding rds+multi shot.
Motar. MOTAR! The best part is that it is repeated, so you know it is not a typo from pig-lips. If you are a fan of this game say: MOTAR!
MOTARMOTARMOTARMOTARMOTARMOTAR
Simple way to get to wave 150+ (10,000+ pts) : have an eng build a bunker, put 2x MG, med, sig and officer inside for a total of 6 pers (max # of troops and still be under arty/airstrike cap). Ranger train mgs as you get more pts, have eng build antenna in bunker and call arty when tanks come. Currently on wave 165. Keep pers in back half of bunker, use heroism on mgs in case of snipers.