Sputnik Skull
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Level: Quarantine Zone
Difficulty: Legendary
Text on the Screen: " Sputnik "
What the Skull Does: Attacks are increased quite a bit...weapons are more powerful such as grenades, rockets, vehicles, melees, turrets, and more.The force of certain attacks and explosions is increased dramatically.
How to Find the Skull: Turn aroudn immediately and go into the tunnel you see until you come out the other end. Go across the area until you see a broken pipe tunnel to the right. There's a small ledge across the wall above a green pit. Walk across it to the end and you'll see the Sputnik skull.