36, I think. One count got 37, one count got 40, but I think I repeated some. So 36.
Oh wow, the 40 was "right," apparently. I kept trying to recapture it after that one time, but couldn't get back up there, so I stuck with 36. Edit: Mmmm, okay. Looked back at it, apparently I usually missed the 3x3's. Except that one time, I guess.