Ok so the idea of this game is to fill in the missing word in each association statement.
For example, if the riddle was:

Angel is to Spike as Faith is to ______

The answer would be "Buffy" because, as Angel and Spike are both vampires, Buffy and Faith are both slayers.

To make it hard, the riddles can be as abstract as you like.

There can be more than one answer to a riddle, the person who sets the question gives props after someone guesses the answer they were thinking of. Double props if someone makes a mistake in the question.
Person who gets the last answer correct sets the next question [Or if you don't want to, just say and in that case anyone can randomly set it].