How to make a pyramid/four-sided sloped roof
From Platinum Arts Sandbox Free 3D Game Maker
To make a pyramid like this: http://i53.tinypic.com/2lbos61.png
Select a 2x2 area, and raise it up 1 cube length. Use Q or the middle mouse button to lower the corners of the square. After that's done, lower the middle two squares on each side. Once this is done, you should have a pyramid!