Riddles of Riddles Returns is the only set in this seven-set organization with a storyline. There has been a murder in a haunted house, and it is up to you to go through each room and find a clue left behind. Once you find all the clues, you must put them all together and figure out what happened. But instead of going through one path of Riddles, you are now allowed to make your own choice on which room you'd like to enter first. Although this set has 16 Riddles, the level of difficulty will take some time to complete.