Basically, you gave to make the "right choice" based on the blood type in the question.
Like, you have multiple choices and you have to pick the one that fists that blood type in your imagination, for example, if there are 2 choices the questions will be "Which one is A type?" and after that, "Which one is B type?"
Makes no sense since you already know the answer after getting the first question.
Thought it was cute but it's just incredibly boring and disappointing.