Reading and writing riddles forces me to use my different intelligences.  Of course, riddles are word smarts, but also I think I use some of my nature smarts for being able to classify things in my head.  Not much intra or inter-personal smarts going on there in solving riddles unless you can know who wrote the riddle and try to look at things from their perspective.  Picture smarts could be how the riddle looks or the use of imagery for creating pictures in my head.  Music smarts comes in when there is a definite rhyme and meter to a riddle.  Body smarts?  Maybe the cocked position I hold my head while trying to solve the riddle.  You see how important riddles are in education?  Remember, it isn't how smart are you, but whatsmart are you.