World War Z | Challenge Mode| Hard (350 blue coins /weekly) Challenge mode: Pinned Down, Weakness, Class Weakness-Slasher Pinned Down: You can be pinned to the ground by far fewer zombies than usual. Weakness: Melee attacks do 75% less damage than they normally would. Class Weakness - Slasher : Slasher will have 50% less health and will inflict 50%l ess damage to zombies