Executing order 253.1125. Locate and secure the H-V IX vial in SEC. D82.1 by any means neccessary. // Incoming Transmission: ''There's something down here with us. Something big. And it's looking for us.''

This is an extremely chaotic rundown with too many levels to choose from. Game balance is completely overhauled and nothing is what you expect. Fight and survive against dozens of enemy variants with custom weapons. A team of four is recommended.