Super Stacker 2 is simple: Just stack the shapes as they come. The trick, though, is to keep an eye on what shapes are coming later as you build.

That way, when you have to add those shapes later, your structure (hopefully) won't fall apart.

Let us know what level you got to in the comments. We only made to it to four, but in all honesty (and our defense), we didn't try all that hard.