Find the hidden Blue Gem

Shut N. Brio up

Defeat N. Gin and his Weapon of Mass Percussion

Make music in an unlikely place

Acquire a Flashback Tape

Earn any Time Trial Relic

Play a game of Checkpoint Race

Try on a Skin

Meet Lani-Loli

Beat a story level without dying

Crouch or slide into a double jump

Reached player level 50.