Hjärnor

Hjärnor is a cooperative miniature game set in the small town Möllinge in southern Sweden during a zombie outbreak in the middle of the nineties. The goal of the game varies with different scenarios, where each player take the role of a hero and combine their forces to survive the zombies and manage with their task.
There are rules for character building and after each scenario the heroes level up depending on the outcome of the session.
The difficulty of the scenario is scaled depending on the amount of heroes and their levels.

—description from the designer