This should help you a bit.

Quote Originally Posted by Jessweeee♪ View Post
Weeeelll I only saw it being played for about ten minutes, and only played a for a few myself, but I think you're just supposed to wander around until you get all 24 of the effects.

Pretty much, but make sure you check out everything you can. A lot of the stuff isn't easy to find without a guide (in fact, I doubt you will find many of them without one-- I sure didn't).