Hi! I have two things about mission mode:

1. Mission mode can be obtained once completing 45 songs.
2. If you complete Mission Mode, everything will be obtained, including all songs!

I hope this helps!

~astroman~

To unlock the song, "Memories", by NAOKI feat. Paula Terry, input the following code using the 2nd player slot in the Menu screen:

Right 4 Times
Up 3 Times
Square 1 Time
Left 2 Times
Down 3 Times
Square 2 Times
Select 1 Time

There should be a swishing sound if you've entered the code correctly. Also, there should be a flashing "NEW!" on the left of the Information tab on the Menu screen. If you check the Information screen, the first icon you should see is "New Song Unlocked #27" in red text. You can now play "Memories" in any free play game mode!

Successfully complete all 100 levels in MISSION MODE to earn the tite of "Extreme Dancer" and recieve a super-secret prize. Achieve this goal to find out what it is.