Originally Posted by bkrueger
Not quite. They used the technical multiplayer environment, but you can play them single player.

Is there any real motivation to play them in single player though?

Originally Posted by JDR13
Is there any real motivation to play them in single player though?

If I remember correctly these additions are not single maps but add ins into the base game so you have additional quests essentially.

But it has been a long time since I tested them, so I am not sure.

Interesting. If that's the case, I have to wonder why they didn't just implement both modes to begin with.

Not liking the game, I didn't play these addons. I re-read the PRs and they each mention multiplayer a million times but the FAQ does indeed say they can be played along — but you need to log into the MP server for access. It doesn't sound like an integrated part of the main game to me:

Tainted Blood FAQs

F: I can't find the Add-On.
A: The Add-On "Tainted Blood" is only available in the multiplayer part but can be played alone.

F: How do i start a map from the Add-On?
A: Login into one of the multiplayer servers, press F12, choose a map from the mission window which begins with [DC1] or [DC3], click on '*Create' and when the connection window appears press F12 again.
Now a map from the Add-On starts.

F: Can i play the Add-On offline too?
A: No

Oh, thanks for the explanation. I think I should have been looking there earlier.