Call of Duty: Modern Warfare 3 has added a whole host of new features across several modes, including a new act for the Zombies mode. Act 4: Contact is the shortest act of the Zombies mode, but can provide a formidable challenge for endgame players.
All Act 4 Missions in MW3 Zombies
There are only two missions that makes up Act 4 of the Zombies mode. Unlike the other acts that require completing the previous ones to access, anyone can immediately start Act 4 regardless of progress through the launch campaign.
