“PuzzlePlatforms” or “Puzzle Platforms”?
Applies to sub-category and About the S01… topic also.
Updated Tue Aug 15 2017 23:18
Hmm… actually, this is larger than just this… it looks like any “hand made” categories/sub-categories include spaces between words… yet ones that are driven (perhaps from automation?) by the course content do not. This spans all courses.
(apart from Gimp, which looks great - if you ignore “S99” 
)