# The difficulty system first used in [[Spring 2015 Event]] returns: you can choose between Operation A ({{lang|ja|甲}}, Hard), Operation B ({{lang|ja|乙}}, Medium) or Operation C ({{lang|ja|丙}}, Easy). | # The difficulty system first used in [[Spring 2015 Event]] returns: you can choose between Operation A ({{lang|ja|甲}}, Hard), Operation B ({{lang|ja|乙}}, Medium) or Operation C ({{lang|ja|丙}}, Easy). |