Return to Castle Wolfenstein?
What is that, like a game from 2003?
I don't see it on the Oculus store, so its not a game that was ported for Oculus, but appears to be a mod of the PC version of Return to Castle Wolfenstein.
So that means you would need to own the game on PC, on a PC that can run it, it would have to have mods to make it work in VR, and you'd have to have some other programs in which they create executable files in which they load up and work with your VR headset.
And then you'd need to connect your headset to your PC using a link