{Interactive Quest} Riddles

Right. So, the only way to do this quest is by chance. Whilst grading an Earth solo post, the admin may decide to give this to you.

A madman walks up to as you wind down your training. He will ask you a series of questions and you will have to answer correctly, and each time you answer correctly, you may give him a riddle. Stump the man and your gains are multiplied by two.