: Essential for survival; costs 5,000 for Tier 1, 15,000 for Tier 2, and 30,000 for Tier 3.
: Earned by completing rounds (e.g., Round 10, 15, 20) or exfilling. Use them to permanently upgrade Skills , Perks , and Field Upgrades . 3 cold war zombies trainer
: Complete the "Coffin Dance" Easter Egg in Die Maschine by shooting five glowing orbs in the Particle Accelerator room; it rewards a free Juggernog perk and a high-rarity weapon. : Essential for survival; costs 5,000 for Tier