As my favorite instrument, and also an element of my game. I choose to use my guitar as a controller.

The good thing is the guitar strings are conductive. The only thing I need to do is wire the MakeyMakey to the guitar and it should work.

There are 6 strings, but I only need 4. Which are corresponding to up, down, left and right respectively.

Then I found out that I can use one of the other two as the ground. So I can just put my palm on it and I can ground it directly. No need to hold the ground wire anymore.