Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This thing is harder than the traditional Rubik's Cube.

Of course, that's not because it's more mentally challenging. It's more difficult to twist and turn the pieces, because they are of different sizes and shapes. Maybe this is the kind of toy you have to "break in" for a while before it seems to work right, but I find it too annoying to manipulate to even bother trying to put the head back together.