Dance Dance Revolution Ultramix 2

Unlock secret dancers - Konsento 03 and Maid-Zukin:
Choose the "Options" from the main menu, then select the "Dancers" option.
Hold X + Y on controller-4 for about 5 seconds at the dancers screen.
Sound will confirm the correct code entry.

Unlock all songs:
Choose the "Options" from the main menu, then select the "Credits" option.
Push Up, Up, Down, Down, Left, Right, Left, Right, B, A, Up, Up, Down, Down,
Left, Right, Left, Right, A, B on controller-4 for at the credits screen.
If you entered the code correctly, you will hear a sound.

Unlock Bonus songs:

Zero One: Reach an "AA" rating on any song.
Toe Jam - Big Idea: Finish Baile Le Samba in heavy mode.
Midnight Special - Love Machineguns: Play 25 songs.
In My Eyes (Midihead Remix) - Midihead: Play 100 songs.
I Feel... (T.O.Y. Remix) - T.O.Y.: Get over 12,000 points on credits game.
GYRUSS (FULL TILT) - JT.1UP: Complete a certain number of songs
G2 - Aya: Play 300 songs.
.59 (Kyd Konami Mix) - Jesper Kyd: Finish Istanbul Cafe in heavy mode

Make A Jam! (Dub/House Mix) - Big Idea: Win Make A Jam mode in all 3
difficulty mode.

MAX 300 (Super-Max-Me-Mix) - Jondi and Spesh: Reach an "AAA" rating on any
song, or finish Maxx Unlimited mode in heavy mode.

Go back to the song selector:
Push Back + Start during any song to fail and return to the song selector.