The war with monster invasion is going on. Opposition Force is almost out of resources. The number of battleworthy is decreasing within every single day. One of research laboratories succeeds to create the weapon ready to strengthen the Opposition and change the course of war radically... You have to get into research center, find new weapon and improve it on the battlefield directly. New chapter in history of the legendary game, including 10 story missions. Autonomous weapon changing game experience radically and bringing in tons of tactical opportunities. Total lack of in-game purchases and obtrusive ads. Ability to play in offline mode. Crowds of monsters on one screen. Non-vanishing remains of the enemies.