: Earned by completing rounds (e.g., Round 10, 15, 20) or exfilling. Use them to permanently upgrade Skills , Perks , and Field Upgrades .
: Essential for survival; costs 5,000 for Tier 1, 15,000 for Tier 2, and 30,000 for Tier 3. 3 cold war zombies trainer
: Run in large circular patterns to group zombies into a tight pack before turning to fire. : Earned by completing rounds (e
Master these essential mechanics and hidden secrets with these expert guides: : Earned by completing rounds (e.g.