Secondary/Tertiary genres or tags would need a great deal of elaboration and contemplation, gonna have to work that out.
Organizing the games in the platform sections by alphabetical genre suffers from the same problem as multi-plats (multi-genres!). Any better ideas would be good., otherwise I'll just do this and shove the multi-genres at the messy bottom of the sections.
???, Rail Shooter, and Sandbox genres added.