Dark Road ► How long can we play in dark road?

[Nukara]

Apparently, this is not a full game, but only an addition, or I'm wrong.
Please explain.

 

[Ballad of Caius]

KINGDOM HEARTS χ Dark Road will be accessible from KH Union χ 's Title Screen, meaning it's sort of an additional game to be played from inside KHUχ . In terms of how long Dark Road will be stretched, no one can say.