New Gameplay Modes:

• Barricade Mode: Defend an army firebase from zombie attack. Use reloadable sentry guns to fight off waves of hostiles.
  
• Auto Perk Mode: Compile a list of your favorite player perks and the game will automatically and intelligently upgrade you during gameplay without any need to pause the action.
  

New weapons:

• M4A1 Carbine
  
• 12 Gauge Super Shorty
  

New achievements:

• All 4 Deadly, Grenadier
  
• Boss Hunter
  
• Weapons Expert
  
• Demolitions Expert
  
• Armory
  
• Arms Dealer,
  
• Fortress
  

New Perks:

• Weapon Station: Upgrades the Sentry Gun to a FLW-200 Weapon Station
  
• Apocalypse: Doubles Wrath of God
  
• Propane Nightmare: Increases the effectiveness of Gas Cannister explosions with zombies outside lethal blast range catching fire
  
• Proficiency: Reduces cooldown period of Hand of God (Wrath of God, Apocalypse), Saw Blades, Venom (Headlock, Payload) Aftershock, Fuse Bolt, and Seekers by 10%
  
• Expertise: Doubles Proficiency to 20%
  
• Mastery: Doubles Expertise for a total of 40%
  

New Powerup:

• Rage: One shot, one kill to all zombies excluding bosses.
  

Nation Red Japanese version now available.