The Blood Group
The Blood Group is a European-marketed combo pack containing the game Blood II: The Chosen and its The Nightmare Levels expansion pack. It can be considered the Blood II the equivalent of the One Unit: Whole Blood combo pack, only with a more limited distribution. Like One Unit it has proven popular among collectors and in many ways its obscurity has made it even more impressive to find.
As an easier to get alternative, GOG sold both Blood II and its The Nightmare Levels expansion pack as "Blood 2: The Chosen + Expansion" in the form of a digital download. In August of 2014 GOG began to sell the game under the title of "Blood 2: The Blood Group" instead.