It did take me a little while to work out that the left and right edges were pinned, and my drag-and-drop didn't do what I intended more than once. But... then you're being tested (unintentionally) on the ability to discern that too, I guess?

Your comment is knee jerk funny, but not generally helpful.

I thought the test was fun to do, even on a mobile touch screen.

Vertical drag and drop from mobile did seem to mess with it but I simply dropped and reset the piece.

That's exactly what I wanted to say. I could hardly move the squares to where I wanted...

I didn't even start. Looked too much like I should have been a paid test subject.

It worked perfect for me.