To unlock the following songs for Arcade Mode, play them in Sudden Death Mode:
Forever Love (K-POP), Love Song (K-POP), Valenti (K-POP), Kiss Me (POP), Power of Dream (POP)
These songs are unlocked for Arcade Mode by playing them in Home Mode (all BANYA songs):
Beethoven Virus, Final Audition 2, Final Audition 3, Mr. Larpus, Turkey March, Winter
To make Survival Mode playable, play Home Mode until you clear 20 songs. This also will make the Random Step Modifier usable.
To unlock the 10 songs listed as all question marks in the Song List, achieve the following goals:
Canon-D-Get 100 Km on Step Mileage
Dignity-Access the password screen in Arcade Mode at least 50 times.
Final Audition 3 U.F.-Get 100 KM on Step Mileage
Flamenco-Play 30 songs in a row on Survival Mode
Go-Access the password screen in Arcade Mode at least 100 times.
Monkey Fingers-Play 20 songs in a row on Survival Mode
My Way-Get 10 Km on Step Mileage
One Love-Get 50 Km on Step Mileage
Point Break-Access the password screen in Arcade Mode at least 25 times.
Street Showdown-Play 10 songs in a row on Survival Mode