Black Ops Cold War opened a new Zombies story, the Dark Aether, and a new way to play it. Players are no longer famous characters but operators of Requiem, a CIA-backed response team, and they start a game with a weapon of their own loadout instead of a pistol. Weapons have rarities, armor can be bought, salvage dropped by zombies builds equipment, and from the end of round 10 a team can call a helicopter and leave the map.
Four round-based maps came out over a year: Die Maschine at launch, then Firebase Z, Mauer der Toten and Forsaken in the free seasonal updates. Every one of them has its First Room board here, from solo to four players.