Gymnasium/swimming pool: Unlocked by grinding the "Roll Call! Opensezmee Rail!" rail exiting the stage area near the bike racks by the second time the bell rings, which is around twenty seconds after starting a run.
Gymnasium/swimming pool: Unlocked by grinding the "Roll Call! Opensezmee Rail!" rail exiting the stage area near the bike racks by the second time the bell rings, which is around twenty seconds after starting a run.