??? Photon, Offline, Story mode. That and...

[The-King]

Can I only do Missions on Extra mode? That seems kinda.. er.. Boring, is it that same online?

[HAYABUSA-FMW-]

??? in the slot of a board for Photons means you can select any type of photon you have available in your PM storage to create the board.

Such as Ban-Photons to add Fire element % for a weapon or armor.