Question: how to unlock the secret characters in ww2 zombies?
Answer: Survived 25 Waves and Prologues. [06:45], Defeat the Panzer Mortar for the First. [11:23], Unlock the Weapon Upgrade Station for the First Time. [11:50], You Need To Defeat the Panzer Mortar by Wave 12. [14:42], Defeat the Panzer Mortar with no Blitz. [15:20]