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"This Dead Island Riptide video showcases a new gameplay element, hub defense missions. These missions involve making preparations &amp;ndash; like hunting down some mounted machine guns &amp;ndash; in order to defend a single location. They also involve zombies. Lots of those."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2013/01/24/9-minutes-of-dead-island-riptides-new-hub-defense-missions/>