Rammbock: Berlin Undead (2010 Germany)

 Rammbock: Berlin Undead

Rammbock tells the tale of a guy who goes over to his ex girlfriend's place to return her house keys. He finds the apartment empty so he goes in. Once there all hell breaks loose in the form of a zombie outbreak. He meets some kid working as a handyman at the building and together they barricade themselves inside the ex girlfriend's apartment. What follows is a more or less typical zombie siege scenario, with some differences. There are survivors in other apartments and they have supplies they need and the other way around, so they are not just trying to keep the zombies out (these are fast zombies), they are also trying to get to another apartment to get the supplies they need to trade with other neighbors. What is original is the way the zombie infection works... (IMDB javier1976)