The rules or features of the game that influence how the game is played. Listed here if it has it's own page and in the genre page if not.
Aim assist - How to hit things on console
Crafting - Follow in the steps of minecraft
Damage - Dps
Dialogue Systems - Are you talking to me?
Gather - Loot it
Health - I hate the beep sound in zelda
Inventory - To sort the loot
Journal - What are we doing next
Maps - Where are we going next
Magic - Roll for wizardry
RPG Game System - D6 or D20?
Resources - Gold, oil and metal.