The objectives : survive to many waves of monsters and kill the boss in the end. After a wave you must run to the trader to buy new weapon , get ammo and other things. The game is epic on suicidal difficultie 200 monsters who can kill you fast come in any direction, so with your team you start to retreat in a house and start welding doors. They start to attack the door and when the broke it ... FIRRRRRRRRRRE In my opinion it's a little good game , fun and perfect to play with friends for a long round .