After Taiko no Tatsujin's Ura Oni additions to the very first Tenkaichi Otogesai song crossovers, maimai's Ignis Danse boost and SOUND VOLTEX's Heaven mode power-up, the Groove Coaster series is the next one of the Otogesai participants to have some of the event's songs made more difficult, as part of an event that segways into the 4th main installment of the series (GC4 Starlight Road).
As a means to that, both of the 2nd edition of the crossover tournament's Groove Coaster songs have received a top-tier-difficulty Extra mode that make the formerly-introduced Hard notecharts pale in comparison! This sure is a way to make both Solar Storm and Scarlet Lance relevant once again...
