Data options
SEGA games receive content updates through option folders rather than direct game file updates.
For CHUNITHM, official options are named A???, where ??? represents a sequence of numbers.
Community-created options often use letters instead of numbers to differentiate them from official releases.
After downloading option files, extract them into your game's Option folder.
Option numbers don't always follow a sequential pattern
It's common to see the numbers jump, for example A113 then A121
The A001 option folder may be required for network connectivity