Regardless of the version, the mode is defined by several core features:
While the full game usually requires a purchase from retailers like Steam or the Microsoft Store , here are the most common free or low-cost methods:
: Some developers have recreated classic maps like Nacht der Untoten and Kino der Toten in browser-playable versions that do not require any downloads.
: Subscribers to Xbox Game Pass PC can download various Black Ops titles as part of their membership, effectively providing the game for "free" within the subscription cost.