'NOTE I do not know for sure what this block would look like in reality. I am just assuming that there are bricks on the sides, since there are usually brick blocks on either side of it.
So we've all (hopefully) played the original Super Mario Bros. game at one time or another, and we had to jump to hit a block with a question mark on it. We usually got a red mushroom that made us grow. I ended up liking that block so much, I had to have my own, that I could take with me everywhere.
"If you do not have balsa wood, or would like a quicker version, hamgravy made a paper cut-out version, with my permission http://www.instructables.com/id/Super-Mario-Bros-Paper-Question-Mark-Block/"
What you'll need for this is:
--Thin balsa wood sheet
--Knife (utility or X-acto)
Youll also need to print off the sides of the block. You could paint it, but it was much easier for me to just print the sides off. I dont do good with intricate painting. Youll find the net I made below.
I apologize in advance for the blurry pictures. My camera is not the greatest.