During a WiFi Match, at the deck selection screen, enter: Up, Up, Down, Down, Left, Right, Left, Right, B, A, Select, Start. After the match is finished, you will receive double the amount of gems.
Successfully complete story mode to unlock an option for Quiz mode at the main menu.
Clear Point, Elimination and J-Star Ranking in J-Arena.
Play through all the J-Ranking modes and clear Point, Elimination, J-Star and Champion Rankings in the J-Arena.
Jump! Ultimate Stars Unlocking battle characters:
To unlock stages for selection in various modes, you will have to unlock the indicated komas, then purchase these stages on their evolution charts. For some, you may have to evolve them more than once to unlock the stage.