Hey, i was just playing MDK2, and on level 9, you know that big maze with Dr. Hawkins?
I found these buttons. They are not really hidden, in fact, some are in plain sight. Anyway, I got around to trying to find them all, I found around 8 or so, but then got to the exit. After killing the aliens, I noticed a cylindrical structure to the right, with a door on the back which wouldn't open.
Thoughts? Anyone know what the buttons do?

Huh. figured it out. Apparently I had just missed a button. The cylinder contains 3 Mr. Fizzys, baguettes, and pumpernickels. a lot of effort for such a useless reward.