@Limboh Yea, I actually only discovered the efficient way of doing the trick after I had made the 3rd level. Originally, I was doing it by having two blocks at the same level, deleting the one I'm standing on while jumping forwards and placing it on top of the one I am going to. It was only later that I discovered how to do it by jumping off what you're standing on, placing the block and then moving back on.

I just built a stair to get the two block pillar, then did the annoying jump.
This is basically like the first level.

I had fun though