Interesting, I found the four way connector, but I’m struggling with the realization of what forms of buildings or ideas that can be sprung from such a piece. I have no doubt there are many fun creations- I just can’t seem to think of what great mysteries this solves. Any feedback would be greatly appreciated, would love to expand my mind. Also, the “level up” wall differences remain an elusive and confusing subject for me. Apologies, I’m still learning...