RPG Categories
Accessory (dice, maps, screens, cards)
Alternate Rules (Variant Core Rules)
Campaign Setting (game world)
Core Rules (min needed to play)
Non-Game Book (but RPG Related)
Non-Rankable Item (item will not show in the rankings)
Quick Start / Fast Play Rules
Scenario / Adventure / Module
Software (for maps, char sheets, etc)
Solitaire Adventure
Sourcebook (rules/options to enhance play)