Do You Need a PS3 to Play Call of Duty: Black Ops? Yes (or 360/PC)

Yes, you need a PlayStation 3 (or Xbox 360 or PC) to play Call of Duty: Black Ops (2010).

The game was released on PS3, Xbox 360, and PC. It is not playable on PS4, PS5, Xbox One, or Series X|S via backward compatibility (unlike some later CoD titles).