gitwut Lv 1
Frankly, I think the Sketch puzzle category should be lumped in with the Beginner puzzles or with the Tutorials. I don't think they should contribute to Global points as they lack any obvious scientific contribution. My opinion, of course, so I'm open to discussion to the contrary.
I suspect the puzzle type may have something to do with wanting to make Foldit available on touch devices? If that is the case, why not just say so to begin with?