: All zombies move 50% faster but have half the health.
: Earn "DNA points" to unlock permanent buffs, such as "Lead Skin" (reduced damage from bites) or "Sprint Burst" (brief speed increase after a reload). zombie-shooter-free-download
: Saving NPCs during missions unlocks "Passive Income" (gear, currency) at your home base. : All zombies move 50% faster but have half the health