So unlike all the other reviewers, I was able to scan for surfaces and place blocks. However, there is no instruction for how to do basic things, like erase a block. There is an undo button, but that only works if the block you want gone is the one you just placed. I also couldn’t find a way to save anything. Basically, there were a lot of basic tools missing, and if they aren’t missing then the user interface is not intuitive enough for me to figure it out on my own. Also noticed there didn’t seem to be a way to change blocks. Maybe brick is the only block so far? I don’t know, because there is literally just a screen with two buttons on it and zero instruction other than ‘scan the floor’.