Add-on
- Audio (Music / SFX / Voice)
- Currency
- Customization / outfit / skin
- Edition upgrade
- Extras
- Game mode
- Item
- Map / level
- Mechanics
- NPC / enemy
- Other
- Player unit
- Story / mission
- Upgrade (Skill / Boost)
[ more categories ]
Other
Anything that does not fit the other categories. The addition needs to be described in the description.