Killing Floor 2

Game description:

Can you survive in the maze of corridors of an abandoned laboratory armed with a machine gun? The sounds of a chainsaw, the clatter of dozens of feet, the growls and screams are echoing in the halls. Wave after wave, a group of survivors must destroy genetically modified ZED mutants. And when everything seems to be over, a massive metal door falls under powerful blows and a boss appears… Survivors grip their weapons tighter and engage in battle with a huge monster. Pull yourself together and make this final breakthrough!