Highlight Kasumi at the character selection screen. Press A to have her hair in a pony tail or X for a long hairstyle.

Beat the game with all fighters. An option to toggle the ending credits will be unlocked on the game settings screen.

Beat the exercise mode, which is inside of training mode, with Kasumi to unlock her school girl outfit.

Finish Story Mode with every character. When the final credits roll, go into Survival Mode with Hayate and play so you can put your name in the rankings. While at the ranking screen, enter EIN. You will unlock Ein playable in every mode except Story Mode, and you'll also unlock a Random Character Select feature.

Beat 20 people in GAME MODE Survival.

Go to "time attack" mode and choose Ein. Beat it with him in under 6 mins to unlock his 3rd costume.

When you turn on DOA3 (DEAD OR ALIVE 3), press Start to skip the introduction and get to the title screen with "Press Start". Do not press Start and wait for the game's introduction to begin. Instead of starting with the Azuchi, it will start in the Aquarium stage. There You will see Helena swimming in the large tank in a red bikini.

Go to sparring mode and in the Doatec HK level there is a little girl naked (shes crouched so you can't see anything) in this glass tube. To get to the room, reposition the view until your back is facing the big glass (it is the glass that when you hit your guy your fighting through he will go into the street) When your back is facing that way (have the fighter your fighting inactive) push your fighter all the way to the other glass that's in front of you. Now use a powerful move that will send the fighter flying forward through the glass and then through another set of glass and you will be in the room. (It is foggy) You will see 3 little girls in glass tubesfilled w/ water. If you hit a fighter into the glass she will move. This may take some time to get right.

Whenever you win a match and your character does his/her vitory pose, you can control the camera by depressing the left stick and moving it in the desired direction. Depress the right stick to zoom in/out.